I'm getting "Failed to get i915 symbols, graphics turbo disabled" error message after installing following softwares and few updates from Ubuntu.

1. Django,
2. Mysql server 5.5
3. Mysql benchmark

And i have installed few updates for ubuntu. It was showing as Security Updates for Ubuntu. After installing Updates the update manager showed that i should restart the system. On restart i got following error message.

" failed to get i915 symbols, graphics turbo disabled". So i tried the work around mentioned here (using the Live CD) ie

1. add intel_ips to the blacklist echo "blacklist intel_ips" >> /etc/modprobe.d/blacklist.conf
2. add i915 and intel_ips to /etc/modules echo -e "i915/nintel_ips" >> /etc/modules

Now when start the system it freezes at Ubuntu splash screen.

I'm using Ubuntu 12.04 LTS, on Dell inspiron N1040. I need to boot the system as i have spend lot of days configuring. Python and Django.

Please help

EDIT : OK when i restarted the system yesterday it magically turned on. Now i can view my desktop. But one problem, i can't mount any of the drives. It says failed to mount Drive. I'm also frequently getting "Ubuntu System Failure" Error Message.