Solve : Motherboard powers on for 1 -2 secs then powers off continuous

1.	Solve : Motherboard powers on for 1 -2 secs then powers off continuous loop no post beep?
Answer» This is what i have so far GA-P55A- UD3L MB Intel i5 1156 DDR3-10600 (2X2GB sticks) Centurion 550 mid tower case W 2 fans 400W power supply After assembly I tried powering it on and it comes on for 1 -2 SECS then powers off in a continous LOOP, I disassembled everything down to just the CPU and CPU fan and still problem remains. When I plug in the 4 pin 12V connector it doesn't come on at all......any suggestions?......Thanks in advancePower_good signal maybe.. Try another power supply of equal or greater wattage.I've had this 1-2 second power on-off thing before. For me it was a loose screw that was short-circuiting my Mobo. Check for loose screws.

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