Strange about the processor, has he installed any new hardware recently? The motherboard is obviously having a problem somewhere. The PSU could be the problem, dropping voltage, and if its not that a blown capacitor on the motherboard (in my opinion).
we did not try the other memstrip cos I managed to break 1 of the white fittings for the 3 slots available and cut my hands try to fit the stick in. It was very difficult to get anything into a slot. Even after removing all of the cables we could to get to the slots.
I'll suggest a new graphics card driver in the morning and try the other memory stick.
Thanks again for your help.
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