Possible CPU problem
I have built myself a system, its an AMD Athalon64 X2 4200+, NVIDIA 7900GT and an MSI nForce motherboard and recently its broken down.
The main problem when windows didn't detected the 2nd core anymore, so I re-installed everything and it was still the same. So I went into the bios, removed dynamic overclocking off (it was at 3% before) and the screen would go blank after the bios. No HD activity or anything. Going into safemode, it hung after Mup.sys.
I googled for the Mup.sys problem, and most of the searches returned that you need to remove something, so I unpluged my graphics card and windows booted, i heard the "tada" noice when it starts, and I was able to shut it down problem by doing "windows key -> u -> u".
Any ideas whats wrong? Any help is greatly appreciated.