Sometimes I can play days and it doesn't occure. But then the black screens always come back. There is no error on the screen. Just black. I disabled the option to restart when system failure. Still no error screen. I haven't got a clue what it could be. The BSOD's occures with several games so it's not game related. I have tested the following: Videocard (asus 7900 GT) : 3dmark ---> OK Hard disc ---> OK CPU - Stress test (2 X 3.4) --> OK Intern memory (1gb) --> OK Temperaturs --> OK The motherboard is a p5nSLI (Asus). I included a few minidumps. I only got two. Not always a dump is created. Who can help me?