>>My PC had been refusing to shut off. Now it won't power up.


> the system, but I would suspect the power supply has failing

It was the power supply. I took it to a local shop who tested
it for free (not including the price of the new one they sold me :-))

I had guessed the motherboard which would have meant
finding a socket A MB quickly (nearly impossible) or spending
$400+ on an upgrade.

Thanks to all who responded.

Gary