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Computer randomly shuts off or restarts, even at idle

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  • Power Supplies
  • Computers
  • Components
  • Power
Last response: in Components
April 30, 2014 4:11:10 PM

Hello everyone. My computer has recently started exhibiting some troubling symptoms. It shuts down (immediate power loss) or will semi-reboot itself and I lose the display. When the reboot happens, all the fans immediately become really loud (or sometimes they fail to spin at all) and the computer becomes unresponsive (pressing the power button or even holding it down does not turn the computer off). I have to manually flip the switch on the back of the power supply to turn it off.

In addition, sometimes the CPU fan won't increase in RPM to compensate for game load and my CPU will run hotter than it needs to at around 70 degrees Celsius. I monitor the temperatures and none of my components have been overheating when the computers shuts off or restarts. It even does this at idle when my computer is only using around 50-60 Watts of power. I have a KIll-a-Watt meter that my computer is plugged into to measure the power usage, and my computer never goes past 250 Watts even when I'm gaming.

At first I thought my new graphics card (MSI R9 270) was bad since the problem started when I installed it and I was losing the display when the computer rebooted, so I completed an RMA and received a new one, however my computer is still doing the same thing. I have a 500 Watt Corsair 80+ Bronze Certified PSU, so I know I have plenty of power for the new graphics card. After completing some tests I discovered multiple errors on my RAM using memtest86+ and completed an RMA for those as well, but that didn't solve the problem either.

Here's the build via pcpartpicker: http://pcpartpicker.com/p/3Bzqy

I built it back in January 2013 and have only purchased the graphics card for it (I was using the APU graphics before) and an SSD. Since then, I have completed a clean install of Windows 8.1 on my new SSD to rule out software problems, and the shut off / reboot problem still persists. I have scanned my hard drive for errors with SeaTools and the results came back clean.

I am thinking that the problem may be power supply related, but I have no way to test it to be sure, and I have no other spare power supplies to replace it with to see if the problem goes away. What do you all think the problem may be? Thank you for any help you can provide!

More about : computer randomly shuts restarts idle

a c 152 ) Power supply
April 30, 2014 4:25:11 PM

I check the asrock website, the A10-5800K is not on the cpu support list, even they said the MB can support 100W cpu like the a10 5800K. http://www.asrock.com/mb/AMD/FM2A75M-DGS/?cat=CPU

I recommend to email asrock to confirm that, or they may have the new BIOS for your A10.
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a c 277 ) Power supply
April 30, 2014 4:35:20 PM

Since your problem started with the 270, that is the area to investigate.

500w should be ok, but the motherboard has to contribute it's 75w also.
You possibly have a motherboard or psu problem.
Borrow or buy a better psu(from a source with a good return policy)
Or... pay a reputable shop to do diagnostics.
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April 30, 2014 6:37:08 PM

cin19 said:
I check the asrock website, the A10-5800K is not on the cpu support list, even they said the MB can support 100W cpu like the a10 5800K. http://www.asrock.com/mb/AMD/FM2A75M-DGS/?cat=CPU

I recommend to email asrock to confirm that, or they may have the new BIOS for your A10.


Thank you for your reply. It was compatible in the past; I don't know if they changed the information on their website or not, but I can send them email and check.
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April 30, 2014 6:48:48 PM

geofelt said:
Since your problem started with the 270, that is the area to investigate.

500w should be ok, but the motherboard has to contribute it's 75w also.
You possibly have a motherboard or psu problem.
Borrow or buy a better psu(from a source with a good return policy)
Or... pay a reputable shop to do diagnostics.


Thank you for your reply. The problem did start after I installed the R9 270, and I actually didn't experience it when I was using the integrated graphics while I was waiting for the RMA replacement. I also used an older graphics card I had while I waited for the replacement, the GeForce GTX 260 Black Edition, which actually requires more power than my R9 270 and the only problem I experienced with it was my computer would not fully shutdown. The monitor, mouse, and keyboard would all power down, but the computer fans were still running. I would have to hold the button down to turn it off completely, but there were no errors in the Event Viewer regarding unexpected shutdown, so it was shutting down properly, just not powering off. Now the problem with random power losses and reboots returns with the replacement R9 270...could it be that I have received two bad video cards that exhibit the same problem? I can try installing and using the GTX 260 again to see if I experience the shutdowns / reboots again to rule out my new graphics card.

Update: So I think I may have figured out the problem. When I first installed the R9 270 graphics card, it was pretty big for my case and I had to route my cables and use twist ties to tie them to the case to make room. Apparently I tied the main power cable for the motherboard a little too tight and the pulling eventually caused a gap between the connector and the board. After reconnecting it, everything is working fine so far.
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