If memtest now runs all night error free it isnt the memory
If prime95 runs all night error free it isn't the processor
If the computer freezes when running video, it might be the video card - perhaps overheating due to fluff or fan not set properly - and I suggest setting up hardware monitoring for that with Rivatuner.
If prime95 runs all night error free it isn't the processor
If the computer freezes when running video, it might be the video card - perhaps overheating due to fluff or fan not set properly - and I suggest setting up hardware monitoring for that with Rivatuner.