This is really strange, to me at least ...
Custom built PC - PCCM848 Motherboard.
PC boots into initial POSt screen, checks memory , drives etc.
The screen then "loses signal" and goes blank.
The PC is still whirring away in the background.
If I press any key on the keyboard, the screen powers up, and it then goes through the boot from A, boot from CD etc and ten boots from the hard drive perfectly.
I don't know if theres a message asking me to press a key in the background and the screen is just inbetween switching display modes.
I've been through the BIOS - can't figure what would be waiting for a keypress at that point.