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. The NOSPIN Group Promotions is now offering Mandrake Linux or Red Hat Linux CD sets along with the OpenOffice CD... at a great price!!! http://freepctech.com/goodies/promotions.shtml