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One Second PSU Power Loop after turning off PC

post #1 of 4
Thread Starter 
Hello Guys, I have a really weird issue:

When I shut down the computer, for some reason after 1-4 minutes, PSU makes a power loop for a second, then it waits 2-3 seconds and then again, continuous loop. All fans are triggered for a split second and caseĀ“s power light flashes as well.

* PC boots and works properly when I turn on the PC *

PC Hardware:

PSU:Cooler Master V-850
Motherboard: Asus Z87-A Bios:1207
Video Card: Nvidia 460 GTX
RAM: 8 GB Kingston DDR3L 1.35V
Case: Antec 302

Weird thing is that PC has been working properly and issue started after using Sleep function on Windows 7 64 bit, not sure if a coincidence...

Already tried the following steps:

Cleared CMOS battery and jumper
Restored Windows to earlier time
Restored Windows Image from a backup
If I unplug all power cables from PSU, PSU makes loop 1 time and the it stops.

Curious thing that I noticed is that GPU fans are triggered by 1 second loop even if both PCI-Express cables are not connected to the video card.

Not sure what else to do, I plan tonight to check motherboardĀ“s front and rear for debris, but PC works properly when I power it up, so not sure if this is a short circuit or not?

I will follow all possible instructions from you guys!

Thanks!!
post #2 of 4
More likely motherboard than power supply.
post #3 of 4
Thread Starter 
Ok Thanks, I will check motherboard tonight, but PC actually works great if I turn it on. Issue is only when PC is turned off.
post #4 of 4
Thread Starter 
Guys, issue has been resolved for me, it was the PSU, I tried another PSU next to the PC and no more power loops. I guess that motherboard killed PSU electricity since nobody was turning on the PC while it was off. At least Asus has great short circuit protection quality on their motherboards.
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