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• arrow keys stop working to scroll pages

  - by Delirium tremens

  Sometimes, the arrow keys stop working to scroll pages. Sometimes, in Firefox - Tools - Options - Advanced - Accessibility - General, the first checkbox, about using arrow keys to scroll pages, appears checked and some other times, unchecked. When it's unchecked, I check it. When it's checked, I keep it checked. In both times, I click OK. Then, the arrow keys restart working to scroll pages. I'm having to do it all the time. What should I do?

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• Num Lock of laptop working strangely [Dell Vostro 1710]

  - by Bakhtiyor

  My laptop model is Dell Vostro 17" and it has numeric keypad. The problem is that its Num Lock key works very strange. Sometimes when I press it the information led of Num Lock activates, but sometimes when I try to activate numeric keypad it refuses and this led doesn't activate and therefore numeric keypad doesn't work at all. Does it mean that I need to change my keyboard at all? In addition Esc key doesn't work for a long time. I think the main reason for that is my son (2year old) who started playing with my laptop from his 1st year. If I need to change the keyboard where can I buy it for a good price, because in Dell I think when I called them 2-3 months ago they offered me keyboard for about more then 50Euros. Currently I live in Spain. Thanks.

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• portable usb harddisk regardless in windows and ubuntu / linux environment

  - by user8184

  I am doing web development mostly in ubuntu. Sometimes i need to go into windows to do other administrative work. Now i am ignorant about file systems. I cannot tell the difference between NTFS and FAT32. My eyes just glaze over the wikipedia articles. All I know is i have been using this 320 Gb portable USB harddisk to save files when I am in ubuntu and when I am in windows. Now i got a situation where sometimes the windows 7 cannot detect the harddisk. I believe it has to do with the file system issue. Or my harddisk is coming apart. To make it easy to backup my files in a portable USB harddisk regardless in ubuntu or windows, please advise me. That means i can go from from linux/ubuntu to portable harddisk read/write files from windows 7 to portable harddisk read/write files the same files. Thank you.

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• Apache stopping downloads part way through

  - by Ben Smiley

  On my site there are some digital files which can be downloaded through a PHP script. The script works fine for small files but large files i.e. 115MB cannot be downloaded successfully. The connection dies after around 15 minutes but it's not consistent - sometimes longer sometimes shorter. I don't think it's a problem with the script timing out because the download time isn't consistent. Equally it doesn't seem like a memory limit problem because the amount downloaded varies each time. Does anyone know of any Apache or PHP related settings which could cause this kind of problem?

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• Why did my laptop turn off?

  - by darenw

  Normally I can slip my running laptop into a backpack, go somewhere, and if it's no more than about half an hour later, it'll still be running. At the destination I plug in the AC power unit and all is well. I run it off of the AC unit before and after the trip, have the screen at less than full backlight brightness, and don't have any peripherals that burn power. Sometimes the wireless switch accidentally slides in the backpack, and that causes extra power to be used and the laptop dies before I reach the destination. Sad, but so be it. But sometimes the wireless switch is off, I've reached the destination in less than 30 minutes (typically 10-20 min), and I know the battery was fully charged, yet the machine is off. Is there a way to determine, after the fact, why the machine shut itself off? I'm running Linux on a fairly powerful Gateway with 4GB RAM, fancy nvidia graphics, dual core cpu, chosen more for number crunching power than battery life, but should last easily for half an hour if not an hour.

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• Laptop HDMI out to monitor DVI in

  - by Roy Rico

  I have a laptop that i'm trying to fix, and it has HDMI out. I have a cable i bought for my HTPC which does DVI out to HDMI in, which worked fine. Was hoping to be able to use this same cable for HDMI out to DVI in, is it possible? UPDATE: Point of clarification, The laptop's display doesn't work (it was dropped) and I'm trying to figure out what's working and what isn't. in addition to HDMI out, it has VGA out, but that seems to have a short in it, and doesn't display properly (sometimes it works, sometimes, it shows stuff in 256 colors in 800x640). I can tell the LCD screen works (comes on) so i think it's whatever is carrying the data to it that doesn't work. I know more often than know, the display is what breaks... The cable i'm using is a standard HDMI to DVI cable, there are no audio connections or anything. Thanks!

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• language input is changed by itself, not only by keystroke of alt+shift

  - by Berry Tsakala

  I'm using 2 and sometimes more input methods in windows I use ALT + left Shift for switching between languages. Sometimes, every once in a while, another action(s) trigger the language switch. It happens in the same application, (i.e. the input language changes for the same app without my request) or, while switching tasks with Alt-Tab, which causes language input to change in an arbitrary application's context. I realized that some of these actions could be the use of the scroll wheel button. It's super annoying How do I disable any other language switching, and stay only with alt+shift? Why does this happen? It happened to my in the past in these and more occasions: middle mouse click pressing Windows key pression Alt Tab (unknown)

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• Problems with merge replication

  - by jess

  Hi, We are developing a multi-user desktop application with users located in different countries. The platform is - .net 3.5, SQL Server 2008, WinForms. Now, my client has used the help of a DBA who has implemented merge replication. To facilitate replication, we made all our primary keys as GUID. Now, we are facing these issues with replication - subscribers expiration sometimes stops replication and we have found no clean way to re-add every change to db schema requires to poll the whole data all over again! This seems to be strange, what could be the problem here? Also, sometimes we have duplicate keys, and that too stops replication I am sure these issues can be resolved. Maybe, we have not gone the right way to implement. Can you suggest how to go about implementing. Or, is the above information enough to diagnose the problem?

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• What are "build-essential" & "build-dep"?

  - by Adam Siddhi

  I am researching how to install Ruby 1.9.1 in Xubuntu 10.04 and I came across the command build-essential and build-dep multiple times. Sometimes it is followed by packages and sometimes it is both preceded and post-ceded by packages. The 2 examples I am looking at are: sudo apt-get install build-essential zlib1g zlib1g-dev zlibc libruby1.9 libxml2 libxml2-dev libxslt-dev sudo apt-get build-dep ruby1.9 and sudo apt-get install ruby irb ri rdoc ruby1.8-dev libzlib-ruby libyaml-ruby libreadline-ruby libncurses-ruby libcurses-ruby libruby libruby-extras libfcgi-ruby1.8 build-essential libopenssl-ruby libdbm-ruby libdbi-ruby libdbd-sqlite3-ruby sqlite3 libsqlite3-dev libsqlite3-ruby libxml-ruby libxml2-dev

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• conditional formatting in excel 2010

  - by bigMir

  I have some strange problem, after I've made switch from excel 2007 to excel 2010 I've started to receive duplicates of conditional formatting rules in excel. For example: I have conditional formatting which colors the cell when it detects that cell contains a word "hello". When I copy this cell to other cells (which also contains the same rule) sometimes I receive duplicates. Those duplicates really slows down excel. So my question is: is there any possiblity to disable copy/paste of conditional formatting (I want to copy/paste all content excep conditional formatting, all formulas values and other stuff). P.S. Just to make it clear, I don't know how to reporduce that problem, it occurs sometimes and I work with excel a lot

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• Laptop charger disconnects and reconnects, charger or battery broken?

  - by Rob

  I've got an Acer Aspire One netbook (AOA-150) and there's obviously something wrong with it. The charging port gets VERY HOT and the charger seems to disconnect and reconnect quickly sometimes. This only happens when the netbook is running, and it doesn't seem to care what it's doing other than being on. The battery has an extremely short life (< 30minutes, sometimes) and I almost exclusively run it on the power cable (which needs the battery plugged in. Having it just plugged into the wall won't start up). Does this sound like a problem with the power cable or the battery? The plug for the cable and the port get so hot that if I held them for longer than a few seconds, I'm sure I'd get burnt. EDIT Just got "Popular Question" on this and it WAS the power jack. The ground on it came loose from the board. A bit of solder on it and everything is working great again.

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• Why many applications close after opening a document or doing a specific actions?

  - by Mohsen Farjami

  I have some encrypted pdf files that have no problem and in my last windows, I could open them easily with Adobe Reader 9.2 and other pdf readers. But now, I can only open non-encrypted pdf files and one encrypted file with Adobe Reader. every time I open almost any encrypted pdf, it closes itself. Also, when I try to search a folder for a keyword with Foxit Reader, once it closed. This is not related to Adobe Reader, because I have the same problem with Word 2007. When I open a document, sometimes it closes instantly and sometimes it closes after a few seconds and sometimes it is stable. My windows is Fresh. I have installed it a few days ago. I have ESET Smart Security 5.2 and I have updated it today. OS: XP Pro SP3, RAM: 3 GB, CPU: 2 GHZ, HDD: 320 GB My installed applications: Adobe AIR Adobe Flash Player 11 ActiveX Adobe Flash Player 11 Plugin Adobe Photoshop CS4 Adobe Reader 9.2 Atheros Wireless LAN Client Adapter Babylon Bluetooth Stack for Windows by Toshiba CCleaner Conexant HD Audio Dell Touchpad ESET Smart Security Farsi (101) Custom Foxit Reader Framing Studio 3.27 Google Chrome Hard Disk Sentinel PRO HDAUDIO Soft Data Fax Modem with SmartCP Intel(R) Graphics Media Accelerator Driver IrfanView (remove only) Java(TM) 6 Update 18 K-Lite Mega Codec Pack 8.8.0 Microsoft .NET Framework 2.0 Service Pack 1 Microsoft .NET Framework 3.0 Service Pack 1 Microsoft .NET Framework 3.5 Microsoft Data Access Components KB870669 Microsoft Office 2007 Primary Interop Assemblies Microsoft Office Enterprise 2007 Microsoft User-Mode Driver Framework Feature Pack 1.0.0 (Pre-Release 5348) Mozilla Firefox 7.0.1 (x86 en-US) Notepad++ Office Tab FreeEdition 8.50 ParsQuran PerfectDisk 12 Professional Registry First Aid RICOH R5C83x/84x Flash Media Controller Driver Ver.3.54.06 Sahar Money Manager 2.5 Stickies 7.1d The KMPlayer (remove only) TurboLaunch 5.1.2 Unlocker 1.9.1 USB Safely Remove 4.2 Virastyar Visual Studio 2005 Tools for Office Second Edition Runtime Winamp Windows Internet Explorer 8 Windows Media Player 11.0.5358.4826 Windows XP Service Pack 3 WinRAR 4.11 (32-bit) WorkPause 1.2 Z Dictionary My startup applications: WorkPause USB Safely Remove TurboLaunch SunJavaUpdateSched Stickies rfagent Persistence ParsQuran Daily Verse ITSecMng IgfxTray HotKeysCmds Hard Disk Sentinel egui disable shift+delete CTFMON.EXE Bluetooth Manager Babylon Client Apoint AdobeCS4ServiceManager Adobe Reader Speed Launcher Adobe ARM What should I do to solve it? If you recommend installing Windows again, what guarantees that it won't happen again?

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• Windows 2003 Storage Server Hanging on Large File Transfers

  - by user25272

  In one of our offices we have a Dell PowerVault 745N NAS device which acts as the main file server. Its running 32bit Windows 2003 Storage Server SP2 with 3GB RAM. The server holds around 60 users HOME folders, which are mapped via AD. The office clients are a mix of XP SP3, Vista and Windows 7. Occasionally the server will completely hang when transferring large files. When the hang happens the console becomes unresponsive with only the mouse active and blank wallpaper. Sometimes stopping the copy frees the server, sometimes not. The hanging can last around 20 minutes. During this time other servers also become unresponsive with blank wallpaper at the console. If you do manage to get onto another server the taskbar and run commands are unresponsive. This also transcends to the client computers sometimes with explorer crashing. I'm guessing this is due to the HOME folder mapping. Eventually the NAS server with free up and everything will be back to normal. The server is configured as follows: PERC 4/DC DATA 2 - 12 SCSI HDD - RAID5 SHADOWCOPY 2 SCSI HDD - RAID1 CERC SATA DATA 11 4 SATA HDD - RAID5 OS 4 SATA HDD - RAID5 All the drivers and firmware is up to date. I've been through all the diagnostics with Dell and the hardware has come up clean including full HDD tests on the arrays. The server has NOD32 installed as the AV, but the hanging happens when it is uninstalled. There are no errors in the event log when this happens and we don't have any errors logged on any of our ProCurve switches. DNS is fine on the domain and AD from what I can tell is running happily. There are no DFS or NFS shares setup either. All the shares are standard Windows. I've unchecked the allow the computer to turn off this device to save power box under Power Management on the NIC. "Set Link Speed and Duplex to Auto-negotiate 1000 " Increased Receive Descriptors buffer from 256 to 352 (reserves more CPU resource for handling data) I've run network traces using network monitor and have found the following: 417 8.078125 {SMB:192, NbtSS:25, TCP:24, IPv4:23} 192.168.2.244 192.168.5.35 SMB SMB:R; Nt Create Andx - NT Status: System - Error, Code = (52) STATUS_OBJECT_NAME_NOT_FOUND I've tried different cabling; NICs and switch ports all with the same result. Transferring files from other servers on the domain is fine. All I haven't done is run CHKDSK on the drives to look for any file system errors. On the Vista clients I have also run netsh interface tcp set global autotuning=disabled with no result. Could it be that the server has a faulty drive or that the I/O is too much for it to handle? Any ideas why would the hang cause issues with the other servers on the LAN? Many Thanks.

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• Can Windows 7 or Vista's Snipping Tool capture a screen 10 seconds later, and capture the mouse poin

  - by Jian Lin

  I wonder if Windows 7 or Vista's Snipping Tool can capture a screen 10 seconds later, and capture the mouse pointer as well? The thing is that sometimes we need to capture the thing that "pops up" when the mouse is over it, so in that case, Snippling tool won't seem to work (because the mouse pointer is activating the Snipping tool instead of pointing at the thing to get the "pop up" item). In this case, the key PrtScn on the keyboard can capture the screen to the clipboard, except it won't capture the mouse pointer, which is sometimes wanted... Is there a way to do that, and possibly say, "capture the screen 10 seconds later, when I am all ready?" thanks.

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• serving mp3s to mobile devices is flooding nginx with partial requests

  - by drumfire

  I am serving mp3s with a minimalistic nginx server. What I see in my log files is that there are a lot of requests, in particular from AppleCoreMedia and sometimes Android useragents, that flood the server with short requests. Sometimes they keep requesting to download the same partial content for a very long time; sometimes more than an hour. For example: "GET /somefile.mp3 HTTP/1.1" 206 33041 "AppleCoreMedia/1.0.0.9B206 (iPhone; U; CPU OS 5_1_1 like Mac OS X; en_us)" "GET /somefile.mp3 HTTP/1.1" 206 33041 "AppleCoreMedia/1.0.0.9B206 (iPhone; U; CPU OS 5_1_1 like Mac OS X; en_us)" "GET /somefile.mp3 HTTP/1.1" 206 33041 "AppleCoreMedia/1.0.0.9B206 (iPhone; U; CPU OS 5_1_1 like Mac OS X; en_us)" [...] I also get a lot, but not as much, of these: "-" 400 0 "-" "-" 400 0 "-" The IP addresses are always from clients that start downloading shortly after that request, usually they have roughly the same UserAgent as in the first example. emphasized text I have enabled server throttling and connection limits in nginx to limit the huge amount of log entries from equivalent IPs at least somewhat. There was a performance issue when I saw the same behaviour on the previous server that used Apache. I installed nginx on a better server then moved the site. When Apache could not handle more connections from the increasing number of clients effectively that server was ddossed. There was no bandwidth issue with already connected clients and I don't know if the already connected clients were using more than one connection at a time. Please tell me: Are clients that appear to get stuck on a download a Bad Thing™ I heard people say their mobile bandwidth use was much higher than they could account for. I'm thinking this type of client behaviour can account for that. And costs us more bandwidth too. Which up to date alternatives exist out there that can handle serving this type of data better than plain HTTP? Useful general insights for someone who just came into this field straight out of the late 90s. :-)

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• 100% CPU Runaway Processes (NCurses?)

  - by BCable

  This is a problem I've had for years, but just haven't posted anywhere about it until now. I'm running GRML, a Debian squeeze based Linux distro, and occasionally certain processes will runaway and cause 100% CPU usage. The only way I can usually know is when my thermal meter on my statusbar will turn yellow. Sometimes I run fullscreen applications when it happens, though, so I sometimes don't catch it, leaving my computer wasting away at my CPU. The processes that I can think of off the top of my head are these: abook, aumix, hnb, wyrd. They are all NCurses based console applications, and there are others that are also NCurses based. Is there a bug in NCurses somewhere that I need patched or something? This also happened on the same distro with the same applications on a different laptop with the same configurations. Any ideas? Thanks!

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• Is it possible to create a delta VM?

  - by iTayb

  I have a VM of approx. 18GB. Sometimes I need temporally clones of it, so I clone it. The problems are: * It takes a while until it's done. * Sometimes I happen to need dozen of clones and I'm running out of storage. I wonder if there's a way to create a VM that saves only the delta (difference) since the delployment out of the source machine. That way each new VM's filesize should be 100MB at most, and creating it will be much faster. I've heard that VMWare View is using this concept. Is such a thing possible for ESXi as well? I'm using ESXi 4.1 with VSphere 4.1. Thanks!

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• Internet Explorer changes brightness

  - by Sale

  I have a very annoying problem with IE8 on Vista: My screen brightness changes when I view a page with IE. It slowly dimms brightness some 20% - enough to be noticeable. This seems to be dependent on the OVERALL brightness of the page viewed or of the amount of bright space on the page... sometimes it dimms down if the page is bright, sometimes the complete different, it dimms when lot of dark space is on the page. I know this sounds weird, I cannot describe it better. It takes about one,two seconds from on brightness level to the other. This ONLY occurs in IE - not in Word or any other application. Please help! This dimming is very stressfull for my eyes.

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• Why do Cisco IOS routers hang in the middle of large downloads?

  - by cjavapro

  After a few years in use. We have seen Cisco 871 and 851 routers that would hang if you had a single download that was more than 100M large. It is intermittent. Sometimes the problem goes away, sometimes it happens on very small downloads (just a 10KB web page). It seems that the just about all the downloads eventually finish, but the bigger the download the longer the hang. Is there a way to resolve this? (short of router replacement which is what we have been doing)

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• Odd domain switching behavior in Firefox and Chrome

  - by Jeremy Detrempe

  We have different development severs and a production server. Testing is done in the development servers. As a QA engineer, I'm switching between these servers quite often throughout the day. In Chrome, sometimes I need to reload a page a few times to get it to pull from the newly switched server. In Firefox, sometimes I need to quit the browser in order to get it to pull from the newly switched server. (We have small tags that indicate which server you are pulling from, which is how I know in-browser.) Why does that happen? I'd love to know how that happens (maybe what it's called?) and what the best way to deal with it is. (I know that Firefox has an extension for domain switching; is that the best solution?)

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• How does IPv4 Subnetting Work?

  - by Kyle Brandt

  This is a Canonical Question about IPv4 Subnets How does Subnetting Work, and How do you do it by hand or in your head? Can someone explain both conceptually and with several examples? Server Fault gets lots of subnetting homework questions, so we could use an answer to point them to on Server Fault itself. What is classless routing and why is class-based routing obsolete? If I have a network, how do I figure out how to split it up? If I am given a netmask, how do I know what the network Range is for it? Sometimes there is a slash followed by a number, what is that number? Sometimes there is a subnet mask, but also a wildcard mask, they seem like the same thing but they are different? Someone mentioned something about knowing binary for this? What is NAT (Network Address Translation).

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• Google Chrome issues

  - by Ben Hooper

  I'm an avid user of Chrome and would defend it to the death but there is no denying that it has issues, and I've been experiencing a lot of them recently. Issues Stuck tabs Issue: Around 60% of the time (higher when the system has just started), when Chrome is launched, some or all of the pinned tabs and startup pages will get stuck in the counter-clockwise-rotating "contacting server" mode and never snap out of it. Fix: Quit and launch Chrome until they load properly (this really isn't good, as quitting and launching Chrome can and has cleared all pinned tabs). Extra Information: If you stop the loading and re-enter the URL then the page will load perfectly. The amount of pinned tabs or startup pages seems to be irrelevant, but I could be wrong.   "Downloaded/out of" Issue: Each item in the download bar has a downloaded status section, formatted as "downloaded/out of". Sometimes Chrome doesn't display the "out of" part.   Collapsed settings windows Issue: In Chrome version 19(ish)+, settings are configured via overlayed / popup windows. Sometimes, the window will open fully collapsed. Fix: Resize Chrome's window or open the developer tools. "Network Error" with large downloads Issue: Sometimes, when downloading large files (500MB+) Chrome will download the entire file, the download status will freeze (for example, "1 GB/1 GB") for a few minutes, report "Network error", and delete the .crdownload file. Extra Information: The same file from the same website on the same computer downloads perfectly in other browsers. The website and file type seem to be irrelevant.   Information: I've experienced some of these issues on my home PC and some on my work PC, both of which are Windows 7 Ultimate x64. The only things that link them are my Google account (all settings are synced). Updating Chrome hasn't worked. Most of these issues presented themselves around about version 17 and have continued right through to 21 (current). Uninstalling Chrome, deleting all data in %programFiles(x86)%\Google and %localAppData%\Google, and reinstalling hasn't worked. I have yet to see whether disabling all extensions would make a difference, but it's hard to diagnose as these issues don't occur 100% of the time.   In my case, I don't know if there's an actual solution. I'm just curious as to whether anyone else is having similar issues to those that I'm experiencing. At least then I'll know it's an issue with Chrome itself.

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• HP Probook 6550b has issues with an external monitor

  - by chama

  I recently got a new HP Probook 6550b laptop for work. However, very often, when left alone (not put to sleep), the built in display will go dark. Not only that, but whenever I plug in an external monitor, the display will blank out as well. Sometimes after this happens, putting the laptop to sleep and then waking it up solves the problem. But only sometimes and only for a short time. The next time I plug in my monitor, it happens again. I know this isn't only my problem - 6 other people got the same laptop as I have at the same time, and we're all having such issues. Any suggestions as to the root of this problem and a way to fix it? It's driving me crazy!

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• Problem whit usb wireless mouse

  - by aiacet

  Recently i have thi problem whit my wireless mouse (Trust model on: www.trust.com/15313). Sometimes when i start the Pc or during a game the pointer/arrow stop to move it. In the Pc start the pointer is blocked on the center of the screen. If I'm lucky i have to chance the USB wirless adapter from port 1 to port 2 but sometimes this trick doesn't work i to use the mouse i have to restart. Like you can see in the productor webpage this mouse don't have the direver but only a tool to solve some problem. Thank you in advance to all the "super-users" that reading this question would be help me Ajax

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• How to fix: mac keyboard ignores "first" key pressed

  - by lexu

  UPDATE 2012.03.19: the MBP described in this post is now broken and recycled (logic board fried). The replacement doesn't manifest the same problems. I tend to believe the problem originated in the keyboard firmware of the old MBP. Every now and then, usually after I haven't pressed a key in some time, sometimes minutes, sometimes seconds, my MBP will "swallow" the the first key I press ... say I'm logging into "superuser.com" .. I start typing my username and the textbox will show "exu" instead of "lexu" This is driving me nuts! My guess is the keyboard or it's controller goes to sleep and fails to wake up propperly ... What can I do about this? PS: I've already installed "MacBook, MacBook Pro Keyboard Firmware Update 1.0"

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