Computer does not power on with graphics card connected. Is this a graphic card issue or PSU issue?

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Dlumb904

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Aug 31, 2013
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I've had my new GTX1080 and 850w PSU for nearly 2 months and they've worked with no issue. However, as of yesterday my PC does not power-on at all. After a lot of troubleshooting I've narrowed down the issue to either my graphics card or PSU.

My computer only powers on if i disconnect the power to my GTX 1080 graphics card or swap out the GTX 1080 for my old HD 7950.

I also swapped out my 850w PSU for my older 550w PSU and got the same issue; However, the whole reason i got a new PSU was because i didnt think the 550w would be able to support my GTX 1080.

So I'm wondering, is the issue with my GTX 1080 or could it be with my 850w PSU losing voltage and not outputting enough power to power on my PC with the GTX 1080 connected. I was able to obtain an RMA from EVGA on the graphics card, but I dont want to send it in if that's not the issue and I do not have an extra PC laying around to test if the graphics card works for it.

Can anyone offer any advice or is more familiar with this and knows which component is the issue? Thanks.
 
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JustCallMeAllen
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JustCallMeAllen

JustCallMeAllen

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If you swapped the PSU's, then I would assume it is the 1080. If your PSU was not outputting the correct voltage, then your PC would not boot at all or you would have much bigger problems than what you have right now. Have you put the GPU in different PCI-E slots or tried using a different power cable for your GPU to see if that would solve anything?
 
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Dlumb904

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Yes, i have tried putting it in different PCIe slots, but I get the same results. I havent tried using different power cables for the GPU as I used the same ones for my older HD 7950 and they worked, so I assumed that they're working.

What really bothers me is that I believe if it really is an issue with the GTX 1080, then my PC should still be able to power on, but with the onboard graphics being used instead of the 1080.
 
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JustCallMeAllen

JustCallMeAllen

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Not necessarily. It could be that there is a shortage in your 1080. So your PC boots perfectly fine without the GPU installed? Can you run a game to see if you are getting any problems with the other components? If you can run a game easily without having the GPU installed, then we can safely assume that the 1080 is your problem.
 
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superninja12

superninja12

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May 18, 2015
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okay let me get you guys a few things clear....

1) the wattage on a power supply is meaningless, 850w or 550w doesn't mean its able to output that wattage.
2) its about the build quality and voltage stability from a power supply.
3) the gtx 1080 runs flawless with a 520w quality psu, it won't run better with a 850w junk or quality power supply.

now you need to attach the HDMI cable to your motherboard and delete the old graphics card drivers(nvidia or amd) and install the new graphics card drivers for your 1080 form the official website, once you're finished plug in the HDMI cable to your graphics card and it should work.
 
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Dlumb904

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When you put it that way, a shortage in my 1080 does make sense. And yes, I was able to run a game easily but with a different GPU. I'll look into getting my RMA for the 1080 done.
Thank you for your help, I just don't like to go blindly replacing computer parts that I'm not sure would 100% fix the issue.
 
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JustCallMeAllen

JustCallMeAllen

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I do know that the wattage is meaningless. I was assuming (wrongly or not) that he had two quality PSUs but at different wattages. The gtx will run flawlessly on a 550w PSU, but it should also have worked perfectly fine with the 850w. I never said that it wouldn't run on the 550w. I agree with James Mason and think he should uninstall the graphics drivers without the GPU in and only install the drivers once the card is in his computer. I never supplied him with any wrong information. He either has a PSU problem or a GPU problem, and if his connections were right and there weren't any issues once the 1080 was removed, then it is most likely the card.
 
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