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CPU wont start when I plug my PSU into my GPU.

Last response: in Graphics & Displays
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October 20, 2013 11:32:21 AM

Hey everyone, I just bought a new radeon 7950 and a new power supply for my pc. I installed the PSU properly, and it boots my computer fine. Next, I inserted my GPU into the PCI-e slot on my motherboard, and when I run the pc, it boots fine and the fans spin on my 7950. The problem is that when I plug my PSU's 6-pin plugs into my graphics card, the fans all start to run, but my CPU doesn't boot. Any idea as to what the issue is? Thanks!
October 20, 2013 11:41:00 AM

What make/model of PSU did you install?
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October 20, 2013 11:52:18 AM

Oh sorry, I forgot to add that:

CPU: intel i3-2100
GPU: Powercolor Radeon 7950
PSU: EVGA 500B Bronze 500 Watt PSU
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October 20, 2013 11:54:46 AM

Have you tried the HD7950 in another computer?
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October 20, 2013 11:58:44 AM

I'm afraid I don't have any computers available that will run the card. It seems to start just fine as the fan is going, and it even runs with only one 6 pin connector, but as soon as I plug two connectors in, my CPU just won't boot.
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October 20, 2013 12:03:41 PM

That would imply a problem with either the PSU or the HD7950.

Do you have another video card (not the integrated video) that you could install to verify the x16 slot is okay?

BTW, just because the fans on the HD7950 turn, that doesn't mean that the GPU is 100% operational. It just means that it is getting power.

The HD7950 does require both PCIe power connections in order to work.
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October 20, 2013 12:07:30 PM

This is my first graphics card, so unfortunately there is very little to troubleshoot with. I noticed that my card does not show up on the device manager. Should it? Or will it only show up when it is connected to the psu?
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October 20, 2013 12:27:03 PM

Is your monitor still connected to your integrated video when the HD7950 is installed?
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October 20, 2013 12:33:18 PM

I've tried it both, connected to the integrated card and to the GPU, but it still gives the same results.
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October 20, 2013 12:34:50 PM

Given this, I suspect that your GPU (the HD7950) is defective.
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October 20, 2013 12:36:53 PM

That's disappointing, should I try having it tested?
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Best solution

October 20, 2013 12:39:34 PM

If you can find another system to check it in, you can test it yourself. Otherwise, I would return it for exchange where ever you bought it from.
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October 20, 2013 12:41:14 PM

Ok, thank you for your help! At least I know the power supply works. I'll exchange it and hopefully have better luck with the next one. Thanks again!
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October 20, 2013 1:18:20 PM

There is a remote possibility that the PSU is the problem as well. But, the GPU is more likely the issue.

Please follow up after your exchange.

Good luck!
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October 20, 2013 9:27:37 PM

I read somewhere that updating the pc's BIOS can sometimes fix this issue for pci-e 3.0 graphics cards. Would you recommend I try that first?
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October 21, 2013 4:20:43 AM

You can certainly check to see if your motherboard has an available BIOS update available. True, there have been some issues in that regard.
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October 28, 2013 3:45:44 PM

Ok, so before I send it in for warrenty, I had a friend try the card on his pc and he just told me that it runs fine with his custom pc and power supply. Any ideas what I should do now? Should I return the card for a less powerful one, or should I try to replace the power supply?
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October 28, 2013 4:53:12 PM

I would suspect your PSU at this point.
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October 28, 2013 5:37:21 PM

Ok, I'll try to get my hands on another GPU in the next couple days and see if I get the same results. Or perhaps purchase a different PSU for the card.
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October 30, 2013 2:36:39 PM

Alright, I've borrowed my friends GTX 550 Ti (Requiring one 6-pin plug in) and tried it with my PC and PSU. This time my pc boots, but I only get display from my onboard graphics. The fans spin on the GPU, but my pc doesn't recognize it, and it's not even in the device manager. Does this help at all?
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October 30, 2013 3:19:21 PM

Nevermind, The card was not inserted all the way. I tried it again and this time the GTX 550 Ti worked fine with my pc. It booted and showed output just like it should. I tried it again with my 7950 and still nothing will boot. Does this mean that I need a more powerful PSU to run the 7950? Or could something else be the problem?
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October 30, 2013 5:59:06 PM

It really sounds like your PSU is not providing enough power to the HD7950.
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October 31, 2013 6:22:24 PM

That's what I was thinking. Looks like I'll have to go pick up a 600w to replace it.
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November 4, 2013 5:14:40 PM

Alright, I just installed a CoolMaster 625w power supply, and I'm still receiving the same the results. The computer just will not boot with those two connectors plugged in. Any ideas?
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November 7, 2013 7:19:17 PM

Still no luck running this card. My computer will not boot no matter what the configuration. Any other suggestions before I resell the card?
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November 8, 2013 6:13:43 AM

What make/model is your motherboard?
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November 8, 2013 7:33:46 AM

Its a Carmel motherboard made by pegatron corp. with Ami 7.13 BIOS it also has two sticks of ram installed.
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