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Ralph Mowery

In article ,
says...

I don't remember seeing a question here about ATX PSUs and motherboards.
So if there is a better forum to ask my question no doubt someone will
tell me where...

My previous computer became progressively more reluctant to boot up and
eventually I gave up and bought a new ATX PSU in case that was the
problem. That was not a cure so I removed the motherboard as well and
bought a new one. That combination has been working ever since, with
enough problems to be interesting, of course...

But I would like to know if anything can be done with the old PSU and
motherboard combination. If I power up the PSU alone by shorting the
green PS_ON connection to ground the fan turns and voltages appear
briefly, but then it goes dead again.
If I connect the PSU to motherboard and short the front panel "on"
contact the same thing happens. The CPU fan turns as well as the PSU
one, but only momentarily.

I took the cover off the PSU but the inside shows nothing untoward.

Is there anything that I can do for some more diagnosis? The
motherboards is a GA-8ISXT-FS and the PSU FSP300-60ATV with a 20-pin
main power connector.

AT one time many mother boards were failing because the capacitors on
them were defective. Look at some of the big ones tops, especially near
th eprocessor and those coils of wire. If they are sort of dome shaped
instead of flat, that would be the place to start.

Sometimes you could heat the board and it would start and then run for a
long time. Cut it off and you had to heat it again to get it to start.

I sent a couple of boards back for replacement due to this problem years
ago.