Check the power supply lead going to your motherboard. It connects in the same area as the reset switch, hardrive led, power on indicator light, etc. Also, if your hardrive cable is backwards or the jumpers are set wrong, it will not power up.
August 19, 2001 11:54:01 PM
I had a similar problem. I discovered I had left in a spacer under the motherboard which didn't correspond to the boards screw holes. This spacer was shorting out the motherboard and was the reason it wouldn't power on. All the case spacers must corresond with the motherboards screw holes.
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August 20, 2001 12:42:20 AM
There are so many things that could cause this, but my money is on incorrect swich header positions. Usually the power switch is not polarity-sensitive, but it may be in the wrong spot. Refer to the mainboard manual for reference. Also be sure to check the simple things like the power supplies' 110/220 switch and the AT/ATX power header that plugs into the mainboard. Even without a CPU in the socket, a system will still power on.
System Engineer, MCSE
Coles Computer Consulting