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A few weeks ago my original power supply, Corsair AX760i, started randomly getting stuck in power on/off loops. It would reboot, the fans would spin up then shut off after 1-2 seconds and repeat. It originally, first occurred when someone plugged a vacuum cleaner to an outlet in the room (not same outlet or surge protector though) but started occurring more without any seemingly reason. Leaving the system off for a few minutes / hours the system would boot. A lot of the times I would see a message about overclocking failed. Eventually, the computer wouldn't turn on, nor the fans would spin, the only thing the PSU would do is click on and click off. The Self-Test on the back of the PSU would neither show green or red too.

I contacted Corsair RMA dept and they replaced my PSU with an AX860i. Cool, I hoped this was the last of it.

Fast forward a week to today and the new PSU is starting to behave like the old. This time I kept the system off for a few minutes then turned it back on and the bios mentioned there was an overclock problem. I didn't boot to OS and turned the system off and hit the power breaker on the PSU until further analysis.

The system is less than 6 months old too. I have another computer in the room and its running fine. I bought a new surge protector too.

  • What's going on?
  • Is it something with the wall outlet? Is there any way to detect surges? The surge protector still says "Grounded"
  • Or is it something in the machine?
  • Is it something as simple as the overclocking failing? (why would that kill the old PSU?)
  • How do I go about diagnosing the parts?

Summary: psu has power issues, psu is replaced, new psu starting to exhibit same issue.

Motherboard - ASUS X99-A/USB 3.1 LGA 2011-v3 Intel X99 Memory - F4-3000C15Q-16GRK Video Card - GIGABYTE G1 Gaming GeForce GTX 970 Hard Drive - SAMSUNG 850 EVO 2.5" 500GB Power Supply - CORSAIR AXi series AX760i (now replaced with AX860i) Case - Cooler Master HAF 932 Advanced Operating System - Windows 10 - 64bit

Additional Information

I installed the Corsair LINK for my AX860i PSU. Here is the info it returns Corsair LINK

The Event Viewer didn't show anything overly suspicious. The Error is from the screenshot: "The previous system shutdown at 9:31:05 PM on ‎12/‎15/‎2015 was unexpected." Event Viewer

  • Anything showing in Windows Event Manager? I would start there. Then, go to sysinternals.com and grab the Suite.. You should be able to start logging data for your Tech at Corsair. – Leptonator Dec 16 '15 at 6:55
  • Your PSU maybe over clocked. This could of been changed in the BIOS Setup. Look through your BIOS Setup and look for things that have something to do with voltage for PSU. When your PSU was replaced it may of just adapted to the BIOS settings maybe put in before. DO THIS AT YOUR OWN RISK If you like you can edit your question with what you found on voltage. – bs677 Dec 16 '15 at 7:42
  • @Leptonator check the additional information I added. What part of the Suite do I need to run? – yxk Dec 17 '15 at 2:19
  • @RACING121 check the additional information I added. What do you mean by the PSU maybe overclocked? – yxk Dec 17 '15 at 2:20
  • Have you reset your BIOS? – bs677 Dec 17 '15 at 19:30
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A solution starts by first identifying a defect. That was not done. Speculated was that a power 'system' component was defective. To identify a defect, the 'system' must be defined - by numbers.

PSU is only one component. Something completely different decides when that PSU can power on, if it can stay on, and even the the CPU is permitted to execute. That would perform power cycling. A power controller (and other 'system' components) remain completely unknown until a meter provides some three digit numbers for the entire system - still interconnected.

Required is a digital meter, some requested instructions, and minutes of labor. Even a teenager can do this. Resulting numbers means the fewer who really know this stuff can reply with informed answers. Currently, a PSU was blamed only on speculation - without first identifying a defect or learning of many 'system' components.

Two options exist. Either continue to replace good parts until something works. Also called shotgunning. Or use a solution even defined in the TV show CSI ("follow the evidence"). To learn what is defective before disconnecting any wire or replacing any part. Latter also means learning how a computer really works. Former often only cures symptoms.

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