On my laptop the screen sometimes messes up producing weird blocks of pixels, and occasionally it recovers but it normally freezes and shuts down. This has occured during the bios screen, windows 7 partition, windows xp partition and ubuntu which was under windows 7. I'm not sure if it's a hardware or software problem.
I've tried reflashing my bios, updating the graphics driver and running a virus scan but to no avail.
Any help is much appreciated, thanks.
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