Well, here's a weird one.

Updated my bios today to 1.50 - shut down and then turned on again. Hard drive comes on, CD spins, fan comes on but is quieter (presumably slower) and I get no video signal.

Hold down power switch, PC turns off. I turn on again and it loads fine.

When I next switch off, the same thing happens on power-up and i have to turn off and on again before I get a video signal.

The weird part is, i can leave hours between the no video power up and my next try and it loads fine - so is basically working in a pattern of one attempt fine, the next not, one fine, one not ....and so on.

Any ideas as to what might be causing this and a possible fix? Would reverting to an earlier bios (not sure what the previous version was unfortunately) be advisable?