Hello,my Win xp was working fine until i accidently moved the power cable a bit and the computer shut down,when I restarted it would load the windows os then get stuck on a black screen,I tried opening in the 3 Safe-modes(normal/network/cmd) but they still gave me a black screen,I tried openning the process task manager but it doesnt open,I enabled VGA didnt work,I tried restoring to the last knowen configuration but it gives black screen and "lsass.exe" operation failed,I don't have the windows Xp installation CD and the F8 menu seems pretty useless so if anyone has a suggestion that is related to the BIOS or not I would realy appreciate it 
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