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PC power starts then stops immediately

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PC power starts then stops immediately

ShadowFax
I have a homebuilt PC, Gigabyte P4 Titan MB, 8X AGP also Gigabyte, SATA 160GB Seagate HDD which has had to be replaced once, 512 Mb RAM - DDR 3200 dual channel- running XP Pro,,,,when it ran. When I push the power switch to start the machine the fans spin for an instant, lights on the case fan flash and all then comes to a complete stop. All other fans, CPU,AGP,Chipset & power supply, spin for a second too. Measured power supply voltages and they seem ok. Swapped out the power supply, same problem. Disconnected DVD,Floppy and HDD one at a time- same problem... and I can't figure out that problem.