My Desktop Shutdown and did not work after it

InvokeMeNot

Prominent
May 3, 2017
2
0
510
My Desktop Shutdown and did notwork after it, i have checked the motherboard and there is a green light on it. i have tried re seating all the components and cables and nothing worked. however, when i unplugged the 4 pin cable of PSU but when you plug it in it doesnt work, all the fans and LEDS starts for 3 seconds and shutsdown immediately. I need your help!
 
however, when i unplugged the 4 pin cable of PSU but when you plug it in it doesnt work, all the fans and LEDS starts for 3 seconds and shutsdown immediately. I need your help!
Do you mean when you unplug the 4-pin cable the pc will boot, but when you plug in the 4-pin cable the PC will not boot? The problem maybe from the MB, which does not support your cpu.

So can you list your whole PC specs?
 


when i unplugged the 4-pin cable it will not boot up but fan starts to work as well as all the led lights.
MOBO: ASUS 1155 p8h61-m le
PROC: Core 15 2520
2x 4gb RAM DDR3
2gb ASUS GT 630
PSU: 900W

i know this is old and i think there is something with the wrong power supply being used for my pc