I have an HP dc7600, 3GB RAM, 80GB SATA HD, with an ATI R3650 (512MB) which has been running Vista Ult perfectly fine for the last 2 years or so and I decided it was time to move to 7. Windows install runs fine until it's time to reboot, at which point it hangs - the monitor stays on but shows a black screen. I can power down the machine fine via the power button, and it starts normally, but once I reboot, back to the black screen. I see the BIOS, POST, but where it should say "Starting Windows", the screen is blank.
I removed all USB and peripheral devices (which included a SATA BluRay drive and the aforementioned video card), reset the BIOS to factory default and reinstalled windows with the same result. There is literally nothing plugged in but the power supply, HD, memory and PS2 keyboard/mouse and I get the same thing - backlit black screen. I left it at this point overnight and all day at work, approx 18 hours. Still it taunts me..... please help.