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Solved: PC loses power when graphics card is connected

Discussion in 'Hardware' started by Goons, Apr 13, 2012.

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  1. Goons

    Goons Thread Starter

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    I bought a GeForce GTS 450 card 7 months ago. My pc did not have enough 4 pin female molex connector so I wasn't able to try the card. I then bought a splitter to solve the problem, it looked something like this [​IMG]

    The pc and the card ran fine and I was able to use it until yesterday. While my brother was using the pc, the power went off. Turning the power on causes the power light to flash and turn off. I opened the case to see what might have caused it and I saw that two cables connecting to a pin in the male end of the splitter burnt and got cut off. Here's a picture for reference [​IMG] .
    The male end was connected to the PSU and the female ends were connected to the fan and the graphics card.

    The system unit was hotter than usual so I thought that the PSU encountered some overheating. I tried the paperclip test to make sure the PSU was working, it was still working so I tried breadboarding my system. The system would boot and act like normal if the graphics card was not connected.

    I swapped my fan (with only male connector) to an older one that I had (has both female and male end) so that I could test with the graphics card plugged. The power light would again flicker once and the pc loses its power.

    I also tried using a different PSU, I ended up with the same results

    What could be the problem? The 6 Pin PCI Express Power Connector looks fine in appearance although I don't have any idea how to check if it was damaged. I haven't tried using another splitter because I can't find any near me and I have a feeling that it might get burned again. I wanted to make sure that the graphics card is not busted but I don't have any other system to try it on. Any ideas, suggestions or solutions are greatly appreciated.
     
  2. Frank4d

    Frank4d Trusted Advisor

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    I see a couple of problems. The GTS 450 card uses about 120 watts on the 12 volt rail, or about 10 amps. That is more than one connector pin is designed to handle, so it is the reason the pin with the yellow wire burned. The flickering power light and PC losing power, and hot power supply indicates the output rating isn't sufficient to power the card in addition to the other hardware in the PC.

    The solution would be to get a good quality, higher wattage power supply, ensuring that it has 6 pin PCIE connectors.
     
  3. Goons

    Goons Thread Starter

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    Thank you for the reply. The PSU was 600W and the brand is Electron. I'll be replacing the PSU since it looked like a cheap knockoff (it didn't even had a manual). Does this mean that the graphics card is still good and I just need to replace my PSU or the card is already dead and needs to be replaced too?
     
  4. Frank4d

    Frank4d Trusted Advisor

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  5. Goons

    Goons Thread Starter

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    Thanks, I'll just get a new PSU, maybe this one . It has 550W and has the required connectors.
     
  6. Frank4d

    Frank4d Trusted Advisor

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  7. Goons

    Goons Thread Starter

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    Thanks, I was thinking twice of buying this. The review helped a lot.
     
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