PSU turns on and off after a second

mannyelcubano

Honorable
Oct 17, 2013
13
0
10,520
Today I tried to build my pc and my power supply turns off immediately after I turn it on. I tried the paperclip trick and It turned on for like 2-3 seconds and then turned back off, I'm guessing the PSU is dead but I want to make sure before I exchange it. P.S All case fans connected to it stay on though

CPU: Intel Core i7-4770K 3.5GHz Quad-Core Processor
CPU Cooler: Cooler Master Hyper TX3 54.8 CFM Sleeve Bearing CPU Cooler
Motherboard: ASRock Fatal1ty Z87 Killer ATX LGA1150 Motherboard
Memory: G.Skill Ripjaws X Series 16GB (2 x 8GB) DDR3-1866 Memory
Memory: G.Skill Ripjaws X Series 16GB (2 x 8GB) DDR3-1866 Memory
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive
Video Card: MSI GeForce GTX 780 Ti 3GB Video Card
Case: Corsair 750D ATX Full Tower Case
Power Supply: Corsair Professional 850W 80+ Gold Certified Semi-Modular ATX Power Supply


EDIT: I looked up and read that my PSU fans turn off under 20% load (I didn't know this since my other pc had an old psu which worked differently) Now I believe what is dead is the motherboard.
 
Solution


Do the test with the 8 pin power cable disconnected from the motherboard.
Connect a fan to a PSU molex connector. If the fan turns off after 2 secs, then yes, it's a power supply issue.
 
Solution