New build won't power up when GPU is plugged in

JeanneAuSecours · May 24, 2016

Hi,

First I'd like to say that this is my first attempt at building a computer from scratch and that English is not my native tongue.
Here is my build http://pcpartpicker.com/p/ZTBcCy

I've just finished putting everything together. Installed Windows on the SSD and things were running smoothly until I tried to install the graphics card in (EVGA GeForce GTX 970).
For some reason, with the GPU plugged in, the computer won't even turn on. No response at all. Can't even get to the BIOS. If I take the GPU out however, no problem!

Actually my computer will turn on if only the 6-pin connector that runs from the PSU to the graphics card is plugged in, or if the graphics card is just in on the PCIE slot of the motherboard and I don't connect it to the PSU. The graphics card's fans work if I do that and the computer boots properly.
However, if I connect my GPU to my PSU with the 8-pin connector or if I connect both the 8 and 6-pin connectors (like I'm supposed to, right?), the computer will not power up.

Any help would be MUCH appreciated. I'm losing patience here... not sure what I possibly could've done wrong.

Please ask me for any additional details in the comments.

Thank you in advance.

Mark_1970 · May 24, 2016

JeanneAuSecours :

Hi,

First I'd like to say that this is my first attempt at building a computer from scratch and that English is not my native tongue.
Here is my build http://pcpartpicker.com/p/ZTBcCy

I've just finished putting everything together. Installed Windows on the SSD and things were running smoothly until I tried to install the graphics card in (EVGA GeForce GTX 970).
For some reason, with the GPU plugged in, the computer won't even turn on. No response at all. Can't even get to the BIOS. If I take the GPU out however, no problem!

Actually my computer will turn on if only the 6-pin connector that runs from the PSU to the graphics card is plugged in, or if the graphics card is just in on the PCIE slot of the motherboard and I don't connect it to the PSU. The graphics card's fans work if I do that and the computer boots properly.
However, if I connect my GPU to my PSU with the 8-pin connector or if I connect both the 8 and 6-pin connectors (like I'm supposed to, right?), the computer will not power up.

Any help would be MUCH appreciated. I'm losing patience here... not sure what I possibly could've done wrong.

Please ask me for any additional details in the comments.

Thank you in advance.

Either the plugs are being inserted wrong or the psu has problems

neatfeatguy · May 24, 2016

Could be a number of issues.

Problem with the motherboard - bad PCIE slot. Try installing the card in another PCIE slot.
Problem with the PSU - bad PSU, can't power the card
Problem with the GPU - GPU is just bad. And yes, the GPU requires both power connectors on it to get proper power.

Things happen, even with new hardware. I had a motherboard just short out on me. I tried three working PSUs just to make sure and I couldn't get it to power. I went out and picked up a new motherboard. I got it setup outside the case, on a box, with a working PSU connected to it and I couldn't get the new motherboard to power. I had to pick up a second new motherboard and thankfully this one worked.

I take it you can get plug your monitor into the onboard graphics and it works?

Your situation is hard to figure out exactly what the issue is without spare hardware or another computer you try the GPU in.

JeanneAuSecours · May 24, 2016

Thanks for the prompt replies. I've tried the other PCIE slot that I have and it didn't change anything.
If the PSU was bad (650w, brand new), would it be able to power my computer without the GPU to begin with?
If the GPU was bad (also brand new) would the GPU fans be spinning at all? Because they do spin as long as I don't plug in the 8-pin connector, like I said...

I've also made sure to set the right PCIE slot in the BIOS' graphic settings. I've also tried to download the latest driver from Nvidia but it tells me it can't detect any Nvidia hardware and is therefore unable to install the driver.

Yes, when I plug in my monitor into the onboard HDMI port it works fine.

And yes, I know... I wish I had another computer I could try the GPU with but I don't unfortunately.

neatfeatguy · May 24, 2016

JeanneAuSecours :

You are providing some power to the GPU, so yes, the fan can spin as long as it gets power. And yes, it could power your computer. Your PSU has multiple +12V rails (4, to be exact). It could be possible one or more are not working correctly.

The issue still could be MB (though most likely is not the case, it would be odd for both PCIE slots to be faulty - not impossible, but most likely not the case), PSU (would be my second guess) or GPU (would be my main guess).

You have to pinpoint the issue and the easiest way would be to test the GPU in another computer. The next easiest thing would be to try a different PSU on your computer to see if it will power up your GPU.

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New build won't power up when GPU is plugged in

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