no output

Hey people, I've installed an original genuine version of windows7 on a formatted disk. It worked fine for a few hours, but when I shutted down my PC, and tried to turn it on an hour later, it didn't work. When I turn on my PC, the screen stays as black as it is when my PC is turned off. I...

Well I just finished installing Windows 7 RC and my audio doesn't work. Well put it this way, it hasn't worked with any Windows 7 i've tried. It said it installed some audio driver but still no sound.. =/ Well I can't print the screen to show you guys but on the volume control where the lil...