Try another known good power supply. I just dealt with the same problem on
a Tyan M/B. It wasn't consistent, but more often than not, I had to flip
the P/S switch off and back on. A new P/S fixed the problem. I think it
might have something to do with the "power good" circuit.
Michael






>I have a Aopen/AK75 SiS 745 MB with an AMD 1700+ Athlon XP cpu running
>on a generic case with a Real Power 230P/ATX power supply.  My OS is RH
>Linux 8.  The problem is when I shutdown linux and the PC automatically
>powers down, it won't power on again with the soft power button on the
>front of the case.

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