Screen breaking up, computer freezes

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http://forums.opensuse.org – My motherboard and processor are under two years old and have always worked happily with OpenSuse, and recently with OpenSuse 11.3. Now my screen display has started to break up, with mouse and keyboard locked. The only route out is to turn off the power. This happens whether I am in OpenSuse or just at the boot up display. If I restarted it happened more quickly, to the point where I could not boot up. I assumed that this was due to overheating, though the CPU temperature was about 42 C and the motherboard temperature seemed OK (around 30 C with the case side removed). I installed a more (Distributions)