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Question

Graphics Card works sometimes, sometimes not

Apr 21, 2015 3:43PM PDT

I do have a really strange problem with my new custom build computer. Roughly every second time I start the computer the monitory stays black although I can hear windows starting up normally.

The computer seems to work normally except the PCIe graphic card. If I "blindly" turn the computer off and on again it might work without any issue or it might stay black again. Sometimes I have to repeat this exercise 3 times before the monitor gets a signal. As soon as the monitor gets a signal the computer works without any issues for hours with load on the GPU. The issue never occurs on a restart, only if the computer has been off completely. If the monitory stays black I do get a signal on the integrated graphic card. The system behaves like no PCIe would be installed at all. The PCIe card just does not start up or does not get any power for the PSU or does not get the signal from the motherboard to start up or what ever..

Unfortunately it is my only computer beside my laptop so I can not swap around any parts in order to rule out components. I have upgrade the ASRocks motherboard to latest BIOS and I have tried all kind of BIOS settings but the problem remains. It looks like the onboard GC can not be switched off entirely in the ASRocks BIOS, I can just give priority to the PCIe. I have also tried to deactivated the onboard GC in the Windows Device Manager, same results

Any ideas?

Thanks!

System:

Board: ASRock H81M-ITX Motherboard
GC: Gigabyte GeForce GTX 960 OC 2GB
PSU: Silverstone ST45SF-G 450W SFX
OS: Windows 7 Ultimate

Discussion is locked

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Answer
That PSU is on the low side.
Apr 22, 2015 12:05AM PDT

That doesn't mean that's it but it is under the usual 500+ Watt I see fitted on game machines. Then again the GPU could be duff.
Bob

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Answer
Same issue
Sep 17, 2015 3:32PM PDT

I have the exact same issue.
If I cut the power once sometimes twice, then it turns on again. Really, really strange.
Have you found any solution to this?

System:

Board: Asrock X99E-ITX/ac
CPU: Intel Core i7 5820K
GPU: AMD Firepro W5100
PSU: Silverstone SFX SX500-LG 500W
OS: Windows 10 Enterprise