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Question

My pc won't turn back on after unplugging it

Feb 28, 2018 11:16AM PST

So this had happened a few times through out the last year. Sometimes when I unplugged the computer it wouldn't let me turn it back on for about 5-20 minutes and it wouldn't show any signs of power either. Yesterday when I unplugged the power cable to move my pc downstairs it happened again, only this time the computer wouldn't turn back on no matter how long I waited. After waiting for about 15 hours and looking around the internet I figured it must be the PSU that is broken since the computer showed absolutely no signs of power. So I bought a new PSU went back home and installed it, and the computer worked...until I unplugged the power cable again to move my pc and now it is back to being completely dead. Can someone please help me pinpoint exactly what is the problem because I don't want to have to spend more money buying unecessary parts. Is there anything that you can rule out? It's like my computer just randomly decides when it wants to start working and then it does so perfectly until I unplug it again and it's dead for however long it feels like. I built the computer myself almost 3 years ago. Specs: Asrock Z97M Pro4 motherboard i7 4790k gtx 980 16gb ram corsair 240 air chassi 1 ssd 2 hdd. The old psu was 550w and the new one is 750w

Discussion is locked

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Answer
Try a different power cord?
Feb 28, 2018 11:25AM PST

Tried a different wall plug? Checked the main cable on motherboard to see if it's fully engaged, past the clip that holds it on? Opened to see if anything is loose in it, like HeatSinkFan assembly, or RAM chips? Did this start after assembling it, or has it been assembled already for awhile? Hear anything like loose screw when moving it? Have the PSU set to the correct voltage in back if it's not auto-setting PSU?

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yes
Feb 28, 2018 11:51AM PST

yeah, I have tried all of those things. I found another guy with the same problem and his solution to get the computer to work again was to: "use a little piece of wire to short ps_on to ground and the thing comes to life". However I don't know what this actually means so if someone would help me decipher this, that would be great.

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If you do that method
Feb 28, 2018 12:23PM PST

You may need to use the back switch to turn computer on and off later.



Here's some pics you can look at too. Basically you short pin #14 to a black or ground, and if to be installed and left shorted, need to do it at the wire side of plug and not the socket side.

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was this the ps_on short thing?
Feb 28, 2018 12:34PM PST

Was this the ps_on thing i asked about because if it is I was mistaken, I have already done this and all it does is confirm that my psu is working.

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Yes, realize that
Feb 28, 2018 8:54PM PST

but for some reason when plugged to the motherboard your "on" switch odesn't seem to work. You can unplug that from the motherboard to test the motherboard itself by shorting across the start up pins and see if it will turn on. If it does, then replace the start button on the computer. Easiest way is a momentary switch from radio shack placed in a new drilled hole in case somewhere.

The alternate is as described previously and use a crossover wire spliced between#14 and a ground wire on the wired side of the PSU to motherboard plug, and then use the switch on the PSU to turn computer off and on instead.