Computer shuts down randomly

0
June 21, 2016

This seems to be a popular topic, but I have not found an identical problem to mine in any forums - maybe you can help

My newly build computer shuts down randomly after a period of time, often around an hour, sometimes earlier. When shutting down the fans keep running, everything else is off, and neither (soft) power and reset button work, only a hard reset with the off-switch.

Here are the components:

  • Gigabyte 990FX-UD3 (Rev 4.0), BIOS F2 (latest)

  • AMD FX8350 (8 cores, black edition, but not overclocked)

  • 8 GB RAM Crucial DDR3 (2 banks) 2200MHz, all memory settings at AUTO and verified as correct, PC3-12800

Gigabyte HD 7870 2GB RAM GPU

BeQuiet 850W Dark Power Pro PSU

Samsung 850EVO SSD Drive, SATA 3.0

3 other (standard spinning drives)

2 DVD writers (SATA)

OS: Windows 10, latest Catalyst 15.3 Beta Graphics Driver

Shut-downs happen:

  • during World of Tanks games, especially when starting up a battle

  • after quitting Shadow of Mordor games (but never during), especially after long games

  • randomly while browsing or using files during internet explorer

  • when I leave the machine running by itself in idle

  • an hour or so after I put the machine into sleep mode (it wakes up, the fans are running, but nothing works, requires a switch-off)

I have tried:

  • replacing the motherboard with an identical version (thank you Amazon)

  • removing all hard drives but the boot drive (that seemed to make it crash more often)

  • updating all drivers

  • running CPU and GPU tests for hours - without crash (for example Valley Benchmark)

All burn-in tests do not cause the Core temperature to rise of CPU or GPU out of their respective safe parameters.

I know the immediate response will be "Windows 10", but why would that cause the machine to wake itself up from sleep mode and die?

The last suspect is the Power supply. This power supply came from my old machine and is 6 years old, but has up to now never shown a problem in a set-up only slightly slower (4 cores, older Gigabyte motherboard).

I am at wits end and have ordered a new PSU to try out if this solves the problem, but if anyone has seen a similar problem or can give me any pointers on what to try - why does the machine crash on idle? Why the complete shut down without the ability to reset?

Thanks for your help

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0
June 21, 2016

There are two main reasons for reboots and freezes and that is under volted system or an overheated system. From what you described it sounds like the latter. What are you CPU and GPU temps under load. I would get a temp meter and a stress tester to find this out.

http://www.ozone3d.net/benchmarks/fur/

For stress test.

http://www.cpuid.com/softwares/hwmonitor.html

For temps.

Post the results. Thanks.

0
June 21, 2016

In the end I gave up and bought a new power supply, a Corsair RM850, same wattage as before.

Not as pretty as the BeQuiet and a bit more noisy, but rock solid. Hadn't had a problem since.

Thanks for your help, I keep those stress test tools in mind.

Cheers

Sven Erik

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