turns on for a split second

dartz003

Honorable
Sep 10, 2013
25
0
10,530
when I press the power button, my computer turns on for maybe half a second then turn off by itself, then maybe 10 seconds later power on by itself for half a second, turn off again. keep repeating this cycle.

https://www.dropbox.com/s/1b4jexm2b3nq9xs/Video%20Sep%2006%2C%2010%2018%2031%20PM.mov

https://www.dropbox.com/s/lrjweawa2z27iud/Video%20Sep%2006%2C%2011%2026%2024%20PM.mov

the blue light was just my case fan led, they flashes because my pc only turn on briefly. then it turn on again by itself a moment later

I plugged a post card into the pci slot, but get no reading because it the system only stay powered on for maybe half a second.
no signal what so ever on the monitor
no post beep
already try cmos jumper/ remove cmos battery
try different memory
I don't have another system to test each component. I don't know if I need to rma any of the component, and I don't know which component is malfunctioned, since the post card cant give me a reading.
 
Solution
Try RMA-ing the power supply and after getting a new one we'll further test. I think you have to rule out firstly a power supply issue.
most likely your psu, if you know of a friendly computer store or someone with a voltage meter i would test the psu. this same thing happened to me while i was building a pc for a guy a couple weeks ago. if it was a short it most likely wouldnt start up for a second. the 12v rail is probably putting out around 5v. it happens with power supplies that aren't seasonic 😉
 
I took the motherboard out, try to boot with 1 ram, moba,monitor and psu, it boots up and the post card gives me code 99. when I put in a hdd, the problem returns and keep turning on for a split second and go off. I remove the hdd, out (take it out of the psu too), but the problem still remain
 
I have been thinking if I picked an under power psu, I am using the Z87 plus asus board, i5 4570k, NVidia 760, 4 ram stick. 5 case fans, a green 5400 rpm hdd, and a 250 gb ssd. the psu is 550 watt.