Perfectly working computer suddenly won't boot. Can't tell if it's MB or PSU.

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Nick15G

Commendable
Oct 14, 2016
3
0
1,510
I hit restart on my computer and now it won't power pack up. This has happened before where when I hit the power button, only the LED lights from my NZXT kraken would turn on. So I would hold the power button till the LEDs turn off and try power on again until it turned on.

Now this last time in would never turn on so I hit the reset button on the back of the motherboard to reset the CMOS. After I hit it, my LEDs on my Kraken turned on. I hit my power button to turn it on...nothing. So I held the power to turn off the LEDs...nothing, they stayed on this time. I opened my case to turn on the computer from the motherboard...nothing. I can turn off the LEDs form the PSU switch on the back but as soon as I turn the PSU on, LEDs back on so I'm led to believe there is power.

OS: Windows 10
CPU: i7 3770 K
Cooler: NZXT Kraken
PSU: EVGA 1050 GS
GPU: EVGA 980 ti
MB: Z77 Extreme4
Memory: G.SKILL Ares Series 16GB (4 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600
 
Solution
getochkn
sounds like the motherboard and the "on" circuit. seen it on lots of motherboards.

Two things you can try. One, pull the wall power for 5 minutes and let all the caps discharge. Even press the power button once or twice while it's off to try to force it to empty the power from them.

If you're ambitious, you can look up the paper-clip trick and try to force the PSU to power on anyway regardless of the power button. It basically invovles taking a paperclip or piece of wire and jumping the green wire on the PSU connector and any black wire. Don't do this if you're not sure, consult a repair shop for more help.

Basically when you press the power button on the PC, a few digital switches get flipped and the PC will tie that green wire...
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getochkn

getochkn

Polypheme
Jul 2, 2006
12,407
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sounds like the motherboard and the "on" circuit. seen it on lots of motherboards.

Two things you can try. One, pull the wall power for 5 minutes and let all the caps discharge. Even press the power button once or twice while it's off to try to force it to empty the power from them.

If you're ambitious, you can look up the paper-clip trick and try to force the PSU to power on anyway regardless of the power button. It basically invovles taking a paperclip or piece of wire and jumping the green wire on the PSU connector and any black wire. Don't do this if you're not sure, consult a repair shop for more help.

Basically when you press the power button on the PC, a few digital switches get flipped and the PC will tie that green wire to ground. This will force the PSU to then supply full 12v and 5v power across all rails and startup the PC. Usually somewhere along the way this gets screwed up and toasted.
 
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Solution
N

Nick15G

Commendable
Oct 14, 2016
3
0
1,510


If this is the case. How would I fix that for my motherboard. I haven't tested my PSU yet but it is only a year old and it has never seemed to have any problems.
 
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N

Nick15G

Commendable
Oct 14, 2016
3
0
1,510
After reading around on forums, I found the suggestion to replace my battery for CMOS. I went out bought a new one and put it in and my computer started right up after hitting the power button on my motherboard... Unfortunately, because I wanted to go back into bios, I turned off my computer and it I was never able to get it to turn back on. Additionally, when I was in the shut down screen, I pop up alert said something about not being able to save and before I could read all of it, it disappeared and shut down. I'm now looking through the internet now to find out what that was and if it had anything to do with my problem.
 
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