Pc has gone through a variety of issues shutting off

lulsauce

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Aug 31, 2014
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I've built this rig before the summer started, maybe in June or July, and It has been running beautifully up until a couple days ago.

One night while gaming, my monitor suddenly lost signal to my desktop, yet my desktop retained power. I thought nothing of it and restarted and continued as normal.

The next day, when I came home, my power light kept blinking about once per second, and I couldn't turn the thing on or off, resulting in me having to pull the plug.

Since then, my computer has slowly deteriorated. I would run games for 30 minutes, or be idling for maybe an hour or two, when either the pc would fully restart, or again, the monitor would lose signal while the desktop stayed on. Soon it got to the point where it would do this during booting, in the BIOS, and during memtest. I'm now at the point where I get the windows 8 logo loading, then the monitor shuts off.

The only things that I can think of that may have caused this are:
1. a blackout, but I restarted and the computer ran with no issues
2. me installing a new ssd, where when I put it in, without configuring it or touching it in any way my pc would only start up after I took it out
3. overheating: my cpu seems to run pretty hot, maybe around 50-55 while idling, 60-70 in games.

Solution attempts:

I've checked for viruses
updated all my drivers
tried a system restore
done a refresh of windows where all my apps were uninstalled,
ran a memtest on one stick of ram with 4 passes, no errors but the monitor still shut off
checked all my connections, loose cables, dusted things off, etc.
booted up with onboard integrated graphics, monitor shut off after about 10 minutes on the desktop
ran windows in safe mode, crashed after about an half an hour

My specs are:
i5 4570
4gb ram
Gtx 770
600w psu
asrock b85 pro4

I've spent the entirety of the day trying to figure this out, please anyone with any suggestions/solutions would be much appreciated.
 
Solution


It's very easy to check if a psu is working or not. Just check if the fans are running. If...

XtremeAero426

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Jan 4, 2014
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The problem is definitely overheating. Your options are underclocking or applying new thermal paste. I recommend the second one. If you don't have any, I recommend this one: https://pcpartpicker.com/part/tuniq-thermal-paste-tx2
 

lulsauce

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To try and rule overheating out, I went into my BIOS and turned off the feature that cause shutdowns at high temperatures, yet the problem kept occurring. Surely my cpu should be able to withstand temperatures of 55 in the BIOS without shutting down?
 

XtremeAero426

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55C yes, but 70C no. Also, I really don't recommend turning that feature off as it lowers your CPU's lifespan.
 

lulsauce

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Aug 31, 2014
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This actually would make sense because when I would leave my computer off for longer periods, it seemed to last longer than when I would frequently try and get it to boot, resulting in me not even getting to the Windows login.

The only thing I'm wondering about though is twice I put my computer to sleep, and the next time I went to turn it on, the power light blinked once a second, and I couldn't hold it down to shut off, nor could I restart. So how could my pc be overheating while it's in a standby mode?
 

XtremeAero426

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I don't know but if it turns off after turning on then you need to move the mouse around (for sleep mode). Also, I've had this problem with my old computer and the problem was with my hard drive (extremely fragmentated and some other issues I can't remember).
 

lulsauce

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Left my computer untouched for over 20 hours to let it cool down, when I tried to boot it up, there was no signal from the monitor whatsoever. Usually I see a windows logo before losing signal. When I restarted, the desktop skipped straight past the option to go to the BIOS and skipped the windows logo and brought me straight to where I can login just fine. Each restart varies between either nothing happening or going straight to the login screen.

At this point I'm fairly certain the root of this problem lies with the blackout that occurred last week, and whether it shorted something in my psu or mobo. Any way to confirm these suspicions?
 

XtremeAero426

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It's very easy to check if a psu is working or not. Just check if the fans are running. If they aren't it's the PSU and possibly the motherboard. If it is working then it is definitely the motherboard.

Note: If your case fans are plugged into the motherboard and the motherboard is faulty they won't receive power. However, the fans on your GPU should be running if you have the cables plugged in and the PSU and GPU are working.
 
Solution