This is an older Gigabyte MA69VM-S2 board for an Athlon 64 X2. There is 520w psu and 2 gig DDR-800 ram. I think I've run into this problem before, but I can't remember what causes it. Although I could be hallucinating. If you turn on the psu from the back panel and hit the power switch, the cpu fan starts up for about 1/2 of a second and then shuts down. Hitting the power on the front panel has no effect until you turn off the psu at the back, wait a few seconds and then flip it back on. Then when you hit the front panel pwr sw, the same thing happens. I think I need to clear the cmos but there don't appear to be any pins, just solder points next to the cmos battery so I have to check before I go around shorting shit. I figured I give you guys something to do in the mean time. You can thank me later.