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I've searched the site for a similar problem but can't quite find one that matches my situation. I had a bit of a scare today. I went to turn on my several month old rig and nothing happened. I saw that there was no power getting to the mobo (mobo and video card lights were both off).

My computer goes through a CyberPower UPS, and everything else connected (monitors, speakers) seemed to be working fine while the computer was not. I reset the power supply switch and also tried other plugs on the UPS but nothing worked. At this point I was pretty sure it was the PSU so I dismounted it and tried it on another computer. Surprisingly I was getting power and I can't say I was happy as my next guess was a mobo failure.

I brought the PSU back to my main computer and plugged it back in to the mobo only this time, and it was working again! I then reassembled the rest of the power plugs and got the computer running and have had it up for a few hours now.

The wall outlet is used for my UPS and a laptop I keep plugged in. Again, my computer was working fine for several months until today. The one thing I did not try before dismounting the PSU was plugging the comp directly to another wall outlet - I was using the UPS the whole time.

I was wondering if this is a non issue or if it's something more serious that I should look into? Could it have just been the wall outlet momentarily going crazy? I can't see how though, as the UPS was not running on battery power at any point and all other peripherals connected to it were powered.

Thanks in advance for the help!

Specs:

i5 3570k (not OC'ed) MSI Z77A-G41 Corsair TX650M ASUS Radeon HD7870

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Could have been a loose connector somewhere. And sometimes a switching supply will simply fail to start up. I'd say don't worry about it, unless it happens again. – Daniel R Hicks Dec 30 '12 at 23:57
Thanks Daniel! I hope it doesn't happen again. – HardSoftware Dec 31 '12 at 1:36
I have seen switching supplies develop a tendency to do this, and slowly get worse and worse. If it happens again then start looking for a new supply. – Daniel R Hicks Jan 1 at 14:23

closed as too localized by CharlieRB, Dave Rook, TFM, Kyle Jones, Josip Medved Jan 1 at 4:40

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