Computer turns on for a split second and then shut down

Computer turns on for a split second and then shut down I searched all over Google for the answers for this and most of them read that the PSU is at fault, but I did the paper clip test where you connect the green wire to one of the black wires (ref: http://aphnetworks.com/lounge/turn_on_psu_without_motherboard_the_paperclip_trick) and the fan spins.
Asked by: Guest \| Views: 232

Total answers/comments: 2

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Guest [Entry]

"Thanks for your help guys. I found what the problem was and it was my power supply.

Even though it was able to give the right amount of voltage and it passed basic power supply tests with Tiger Direct (computer retail store) with some sort of volt meter, they diagnosed the problem as a incompatibility issue with my motherboard and power supply. This diagnosis was wrong and the power supply was defective. I replaced the power supply with a brand new power supply with the same model and it works.

The specs are:
Power supply: Corsair CMPSU-550VX 500W ATX 12v
Motherboard: Gigabyte MA785GM-US2H motherboard"

Guest [Entry]

The first time I built my own computer, I installed the CPU heat-sync and fan incorrectly. The computer would turn on briefly, but then shut off since the motherboard sensed that the CPU got too hot. Are you sure you have installed the CPU/RAM correctly?