Ctrl-Alt-Delete at GRUB messes with AGP slot?
Last night I pressed Ctrl-Alt-Delete at the GRUB menu to restart my PC (which is what used to happen) and change a BIOS setting. Instead of normally rebooting, the signal to my monitor just died. Rebooting didn't do anything. I tested the video card and monitor with another PC, they both worked. I also put another video card in this PC but that didn't change anything.
I thought I might have accidentally messed up a BIOS setting, so I unplugged the PC long enough for the CMOS battery to run low enough to lose BIOS settings changes. With the original hardware, signal came back to my monitor and the BIOS settings were the defaults. I tried to find what exactly was the problem, so I pressed Ctrl-Alt-Delte at the GRUB menu again. Signal to the monitor was lost again. However, this time I had the default BIOS settings and just flipped the switch on the PSU off and on (didn't leave it like that long enough to reset the BIOS settings) and the next boot up worked.
I saw some warning after I flipped the PSU switch from the BIOS that some FSB/SDRAM frequency setting might needed to be changed.
This is reproducable every time.
What could have caused all this?