System briefly starts cpu fun, then shuts down, no post.

Burzumoza

Honorable
May 14, 2013
5
0
10,510
I have a ASUS P9X79 LE, a i7-3820, Crucial DDR3 BallistiX 1600Mhz 16GB, corsair cx 750M PSU, gtx 680, with ssd system 120 gb, storage disk connected + dvdwriter/reader. My system has been running fine for 7 months, today i conneted a gtx 550 ti, only thing i can think of is that it was a short cable, so it was a tight fit. I tried booting up, but only got a brief flash in power led, and nothing when i tried again. So i tried to pull the power out while holding the power button (a tip i got) nothing. So i the mobo to another corsair 750 i got, and this time it briefly blinks in the led power, and the cpu fan starts and shuts down again. (no beep, no post) So i put the mobo on the old psu again, and try to boot up, the cpu fan starts for half a second, also the power led, then system shuts down. I got a green led lighting on my mobo when i turn the power switch to the psu, so psu seems to be giving of power. I need help, anyone able to offer a good tip?

Edit, : ive also tried taking the RAM out, boting with no ram, only leading to the no reaction if i dident hit the psu power switch or manualy plug in and out.
 
start here
http://www.tomshardware.com/forum/261145-31-perform-steps-posting-boot-video-problems

you must go though this guide first before we can help u let us know if you found ur problem or still need help after trying all the items in it. (I got in trouble for helping someone else for this with out sending them though the guide first)
we will assume you checked all these after this point so please really go though the list
 

Burzumoza

Honorable
May 14, 2013
5
0
10,510
yep i spendt last night with that guide and a few others trying to figure this one out. Cant be a short. After fiddeling around the psu dosent continusly start now, it just starts once, and i have to remove power socket to get it to try start for a milisecond. i have not tried shorting the psu, i wil try running breadboard from the psu on another mobo maybe....im frustrated atm :/