There is no signal to the monitor, it powers up and there is the initial beeping sound, cd drives, HDD, floppy and all lights and fans work fine. It doesnt boot up. I googled to try and solve the problem and have tried a process of elimination, so far I have:

1) CHecked video card - I replaced with an old one which definately works and still no activity. I then thought it could be the AGP slot but when I put the original card back i removed the power connections for it and it started beeping, so I presume the slot is ok? Not sure though.

2) Made sure all cables were in correctly - yes

3) Removed CMOS battery and replaced - no difference

4) Memory - removed one stick - no difference, removed other stick - no difference.

4) CHecked CPU - seemed to be seated in correctly but removed and replaced anyway, again no difference.

5) Monitor - monitor screen works as it displays 'no signal' when it attempts to boot.

I'm stumped as to what to do next, but I think its maybe the processor, I'm suprised I get no beeps or warnings about it though?

Can anyone help?

Many thanks,

Andy

System is: a Athlon 3000+ (oc to 3200+), Asus K9N Motherboard, 6800GT graphics card, 1gb ram, 160gb HD, 350w PSU.

what graphics card is it?

System specs are at the bottom, its a 6800gt AGP. But I tried an old card which does def work and still the same problem.

This is a bit of a long shot but i have had this problem a few times. just try unplugging the power connection to the hard drive or the cd drive or even both and see if you have display then

this has happened to me twice with different computers. everything was okay and i finally solved it by replacing the motherboard with a another board of same make and type. used all same hardware and cpu. problem over. i dont know if it was done by a virus or i think i may have disturbed some registry settings during cleanup.
this should get rid of a major headache and have you back on track.
good luck,
dan

I took a calculated guess and decided that it probably was my motherboard that was fried, so I bought another.

Hey presto, PC working again!

Dunno what caused it, I didn't mess with registry, wouldn't of thought a virus could damage hardware?

a virus can possible damage a bios but thats unlilkely