Has my mobo gone?

[Gingerbread Man]

Computer used to work just fine. Then it went through a phase of not turning on correctly, well it had power, fans in their ready state, low RPM, but it never went to POST.
Now the power button does nothing. I believed it to be the PSU. Just put a new one in, nothing. No change. Power button does nothing.

I have tried bridging the cable out, the jumpers on the motherboard for the power button. Nothing.

Next step I believe is the motherboard? I don't think it's RAM or graphics etc as it's not evening posting, it's doing nothing. Dead.

Am I right in my prognosis? Any other steps?

D

[aizvara]

Gingerbread Man said:

Computer used to work just fine. Then it went through a phase of not turning on correctly, well it had power, fans in their ready state, low RPM, but it never went to POST.
Now the power button does nothing. I believed it to be the PSU. Just put a new one in, nothing. No change. Power button does nothing.

I have tried bridging the cable out, the jumpers on the motherboard for the power button. Nothing.

Next step I believe is the motherboard? I don't think it's RAM or graphics etc as it's not evening posting, it's doing nothing. Dead.

Am I right in my prognosis? Any other steps?

D

If it has failed slowly it might be worth taking a look at the motherboard's capacitors if you've not already.

You could also take out the RAM (or anything else you suspect) and see if the symptoms change.

[annodomini2]

Strip everything off the motherboard, except the bare minimum it needs to beep.

So PSU, MB, CPU, Speaker.

See if it works then.

As above check for exploded caps.