Hang in there.
I recently reset the BIOS on my Abit NI8-SLI (another NForce 4 MB), and had a hell of a time. I could not even get into BIOS setup. It would hang at detecting drives, even though I had pressed DEL. I tried a PS2 keyboard in case USB was the problem, no help.
Finally I unplugged all my drives, and then I could get into BIOS setup. I set the floppy type at "Disabled", and also disabled the integrated floppy controller. I set the boot order at CDROM first, and HardDrive second. I saved settings, and turned off the PSU after it tried to boot.
After I plugged my drives back in, I turned it on, and it booted with no problems.
The halt options would be with fan settings in advanced options somewhere in the BIOS. I set just the option for CPU temp, to halt on the lowest setting available.