AIO The power light comes on and I can hear the HD starting up. the CPU fans start and stops. Nothing else happens, and there is a Black screen. can't get into bios, Nothing the Power supply fan is running. What should I try? Built 1/15/10, Win 7 Home. I was reinstalling win 7 in win 7 saving nothing. running very slow. took 2 hours just to do the first part. left room at 75% complete came back in 8 hrs (slept) the Computer screen was black and the power button was still lit..