Hi guys,

I've got a problem which is confusing the *censored* out of me.

I overclocked my PC about a year ago and it's been running stable for over a year, now it has suddenly stopped working. It crashed when I was using it and now it won't work again.

When switched on everything is getting power (fans turning, hard drives running, motherboard LIGHT on etc.) however the monitor remains blank and the PC doesn't beep to suggest that the POST has successfully completed.

I have tested the monitor and it works FINE on another PC.

I used a PCI debug card to attempt to diagnose the problem and when run it came up with a code 81, which according to the documentation, suggests a keyboard input error. When i'm booting the PC i have no devices attached to it and i'm beginning to think its the motherboard circuitry that's at fault.

Is it worth clearing the CMOS?

Also the same thing has just happened to me on another PC, after taking out and replacing the monitor cable whilst it was running it now has the same above symptoms. Is hot-swapping VGA cables dangerous?

The only thing the two PCs have in common is that they are both using LG monitors which show 'Analog power saving mode' when you switch them on and then turn themselves off.

Any help would be GREATLY appreciated!Here a few things I would try first, take out the RAM see if it dont beep, try the video card in another machine or replace it, usually at fault when this happensClearing the CMOS is worth a try at this point in time...
NOTE: Your overclock settings will not be retained.

Borrow or buy a PS2 keyboard also...everyone should have one

Hot swapping VGA cables is dangerous and could very well be the reason you now have no video.Thanks for your helpful comments.

I tried booting the PC without the video card in and still had no beeps.

I then tried booting the PC without the video card and the RAM and I had three short beeps [pause] then three more short beeps, i guess this just means no RAM.

If I had onboard video then I would have a way of determining whether or not it is the video card that's at fault.

I'm still not sure whether it could be the motherboard or not?

P.S. I wasn't aware of the risks of hot-swapping VGA cables, thanks for the tip!To determine if it is in fact the vid card install it in a working machine and install it's drivers...if it doesn't work in the 2nd machine i'm afraid it's dead but you'll know it's not the MBoard.For what it's worth:
Welcome to BIOS Central.Quote from: dahlarbear on April 08, 2008, 01:28:03 PM

For what it's worth:
Welcome to BIOS Central.

Quote from: dahlarbear on April 08, 2008, 01:28:03 PM

For what it's worth:
Welcome to BIOS Central.

And ? ? How are you convinced this is a BIOS issue ?