Since installing Ubuntu 10.10 from Karmic I've started getting problems with starting up the PC. I've done a complete wipe (Boot and Nuke) of the hard drive and reinstalled Ubuntu 10.10 but the problem still occurs. There is no dual boot on the PC, just Ubuntu.

Here is the problem:

Each morning, when I turn the PC on from being off overnight, the PC starts up and loads the BIOS. I get the following message

Verifying DMI Pool Data... K8 NPT Data Change...Update New Data to DMI!.......

Then poof the computer shuts off.

However, after switching the computer back on around 6 or 7 times after it's turned itself off, it will eventually boot up without any problem. Also, once up and running for a while, I can shutdown and restart the PC first time, without any issues.

I have also noticed a problem with the USB mouse being recognised and once I finally get the computer booted up, I need to unplug and then plug the mouse back in to get it working.

I've opened the PC up and checked the connections (cables, cards and memory) and it all seems fine. The main issue with troubleshooting this problem is I cannot test any suggestions or fixes until the next morning because once the computer is up and running it will remain so! I do not leave the computer on overnight to save energy.

So.. Is this a hardware / boot software issue? This is a very odd problem and I have googled to no avail. Any suggestions?