PC won't boot after gpu upgrade

frashure11

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Aug 29, 2014
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I've looked around, but so far no other solutions have been of any help.

I have a Gigabyte 970A-UD3 mobo, 8GB of RAM, 3 HDDs (1TB, 500GB, & 250GB), 700 Watt Coolmax PSU, and a XFX 7850 2GB GPU.

Problem: I bought a MSI 7950 3GB card (used, but taken care of) and when I tried to turn my pc on after plugging it in, I heard one long beep followed by two short ones. I let it run for a minute but after nothing coming up on the monitor I shut it down. I then plugged a second 6-pin cable thinking it was a power issue, but then the only thing that happened was my LED fans flash on then turn back off. After that I put my 7850 back in and the pc works just fine. Using to type this actually.

My rig is less than a year old so I don't think it would be my PSU losing its max output, but I'm not an expert on PSUs so I could be very wrong on that. Any help is appreciated.
 
Solution
The maximum output of the psu is fine for the card. It comes down to amps tho, maybe it just cant put enough juice into that card to sustain it? Or the card is simply faulty

sponge689

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Aug 6, 2013
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The maximum output of the psu is fine for the card. It comes down to amps tho, maybe it just cant put enough juice into that card to sustain it? Or the card is simply faulty
 
Solution

dzsonni

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Nov 25, 2013
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From the beep code and your MB manual we can be sure that the problem is the graphics card. Can you test it in another rig? Did the previous owner show you it was functioning?
 

frashure11

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Aug 29, 2014
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Sorry it took so long to pick a solution, I was busy at that time and thought I already did. After looking more into it, I think it has to do with the power distributed over the 12v rail. It just doesn't have enough using both (my other card only needs the one).