I'm going to toss out here that the image is a BSOD.
A BSOD is a bunch of white lines of text on a blue screen. I can't see the lines, but that color sure is familiar, eh?
A BSOD is a Windows trademark which is why you might not ever see it in Ubuntu. There may not be an equivalent.
While the computer is crashing for a yet to be determined reason, it is also whacking the display so badly the information on the BSOD (or anything) will not be readable. The system locking up is also a symptom of a BSOD - no mouse, no keyboard, nothing but a reset button. It happens at seemingly random times (lately).
I often suspect hardware when I see a BSOD if no software type changes are admitted. While you have your video card in hand, try anothor slot if you can, and also clean it out from debris, check cooling fans (power supply video card, CPU). Use common sense and there is a tutorial in the tutorial section.
Any software/hardware changes lately?
While you your screwdriver, methodically reseast all the cables, connections, RAM, etc. for all devices in a manner where it is impossible to get confused and make a misconnection (one at a time).
To help isolate heat problems, if you leave your system off for a while and it cools down does it last longer but the problem always comes back when it warms up? If you restart it right after a crash does it only last a short while? Is that a reproduceable pattern? Cool = works. Hot = fails.
I am a BSOD novice (and happy to say so), so maybe the the BSOD experts can recommend the best method to capture the info in a dump file to help see what cannot be seen at the moment of failure if there is agreement and usefulness to catch the possible software issue.
Edited by joseibarra, 23 July 2009 - 06:00 AM.