PC won't turn on (looking at PSU, mobo and CPU)

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andres_lupo

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Sep 11, 2015
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Hi, good day all.

I was watching a TV series when all of a sudden my PC just turned off.

I tried turning it on again but it won't. As soon as I plug it in and push the power button, there's this click-click noise I hear from the PSU. But power up fails. PSU goes click-click again after a few seconds (as if it's trying to turn itself on again) but PC fails to turn on.

So I removed my RAM sticks, hard drives (both power and data cables), GPU, tried turning it on again but failed. I read somewhere that I should erase my RTC RAM so I did that too but no effect. I removed panel connectors except for the Power Button but nothing still.

I tried putting all back together again but this time the PC no longer attempts to auto power (no more repeating click-click noise from the PSU).

I can't really say that my PSU and mobo are at fault since my mobo is still supplying power to some of my peripherals even though it's turned off (my USB illuminated keyboard is still lit and I could still charge my other devices thru the USB ports). It's one of the features of my motherboard.

Note that this is not a new build but has been working for almost 10 months now.

I would like your suggestions on what possible actions I could take on testing my mobo, CPU and PSU. Thank you very much.

My rig is:
Intel Core i5 4690K
Asus Z97 Pro Wi-Fi ac
Cooler Master CM 750W PSU
8GB (dual) DDR3 1866 G.Skill RipJaws X
2TB Seagate Barracuda
2GB Asus GTX 750 Ti Strix OC Ed.
Aerocool AC PGS VS3 Advance Case
 
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andres_lupo

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Sep 11, 2015
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I had it unplugged overnight. I unplugged it for 10 secs as you suggested. Pushed the power button while unplugged for at least 10 secs.

There's also this power indicator on the mobo that tells me if there is still residual power in the board. It turns off when unplugged for at least 5 secs..

So yeah, nothing at all.
 
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smorizio

smorizio

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Jan 22, 2010
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pull the power supply for safty. take a paper clip with the shupply unplugged and off from the wall. look on the 24 pin connector for a green wire. take the paper clip from the green wire to the nearest black ground wire. try this trick outside in case the supply goes pop. if the supply turns on and there no issues could be a dead short in your rig. if the supply pops or will not run time to rma it.
 
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andres_lupo

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Sep 11, 2015
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Your instructions weren't very clear or complete so I searched for the actual YouTube video on how to test PSU. The video is demonstrated on a Corsair PSU but I hope it is the same for all manufacturers. YouTube link here: http://www.youtube.com/watch?v=5FWXgQSokF4&feature=youtube_gdata

I did the test with and without a case fan load and the PSU won't start. I guess the PSU is busted. No way to be sure it is the only problem though so I might as well bring my whole PC to the store for checkup.
 
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andres_lupo

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Sep 11, 2015
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That's what got me confused. It supplies power to the mobo (proven by how I could still use the USB ports for charging other devices). But it simply won't power up.

I did the paper clip test using a case fan as load but the PSU won't power up still. Is the paper clip test a good and proven indicator of busted PSUs? YouTube link for paper clip test here: http://www.youtube.com/watch?v=5FWXgQSokF4&feature=youtube_gdata
 
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eatmypie

eatmypie

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Sep 12, 2013
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Just because a power supply comes on and even if you can charge a usb device doesn't mean it's not broken. It could be other things but I'm just trying to get the point across that until the power supply has an actual load even a system POST load you can't tell if it's dead or not. It could be a number of things still. Like your system most likely doesn't use that much power, so I would just buy the cheapest 350+ watt power supply you can with the right connectors and see if you can get it to post. Consider the cheap power supply as a diagnostic tool only
 
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andres_lupo

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Sep 11, 2015
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I installed my PSU on another working PC and it didn't power. I tried the paper clip test with the PSU of that PC and it works. So I think it would be safe to assume by now that my PSU is busted. I could still request for a replacement unit since this is still within warranty. As for testing my mobo and CPU, I'll be borrowing a PSU from a friend. I'll post an update once I've finished testing it.
 
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