Yes also one dodgy stick of ram can make the pc shut down almost as soon as
it comes on.
Brian

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"Brian Reay" wrote in message
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Dave Plowman (News) wrote:
Got a fault on the old ASUS desktop. Running Win7.

For ages at start up it has said CPU fan fault - but pressing F1 gets it
going and it's fine afterwards. The CPU fan seem to run normally, and I
tried replacing it.

But now, press the power button and it doesn't even get to the start up
banner.

Main fans and CPU fan running, though. But not the PS one. Press and hold
the reset button makes that run. Release and it stops.

Play around and it will sometimes boot but crashes soon afterwards.

Worth trying a new PS? Or would any fault in it be obvious?


Have you tried reseating the memory, replacing the back up battery,
checking any socketed devices are pushed home.


It is always worth vacuuming out the dust etc, especially from between
heat
sink fins, while you are in there.

I've recovered a surprising number of dead PCs with nothing more than the
above.