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  1. #1
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    VIII Formula Not Detecting GPU (gtx 780)

    I turned on my computer last week and my monitors didn't wake up or display an image. I could hear windows boot up as well as skype alerts, but no image on either screen. I though at first my video card ate it, but apparently that's not the problem.

    I tested my video card (gtx 780) in my old computer, and it's working just fine. So I then assumed my motherboard was to blame, which was an instant headache. So I took an old video card I had in my closet (gtx 560), put it in my 'new' computer and it's working as expected. I've done some reading around and I can't find anyone with this specific problem.

    Things I've tried:

    • made sure it was seated well and locked in
    • used compressed air on the PCI-Slot
    • cleaned the video card connection with rubbing alcohol
    • tried the other PCI-E (8x) slot on my motherboard
    • replaced the cord connecting my video card to the power supply
    • tried a different power supply entirely
    • tested the 780 on another computer and it works
    • currently a 560 is in my computer, and working fine


    I can't come to a conclusion as to what part is causing the problem. Everything seems to be working on it's own, but not together. It seems that I either have to send in my motherboard, or replace my video card but I can't pinpoint what one is to blame.

    System Specs:
    http://ca.pcpartpicker.com/user/brooker/saved/jj6323

    BIOS hate:
    https://imgur.com/ljV7gaq

    Tldr;

    • Video card (gtx 780) works on another computer, but not mine.
    • A second video card (gtx 560) is working on my computer.
    • Replacing my power supply had no impact.

  2. #2
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    Are you using a monitor or a TV? And which connection are you using to connect your system to the monitor/TV?

  3. #3
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    Quote Originally Posted by Chino View Post
    Are you using a monitor or a TV? And which connection are you using to connect your system to the monitor/TV?
    A monitor, the Asus VG248QE. I usually use DVI but I've tried both DVI and HDMI on all of the video card's outputs.

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  5. #5
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    Quote Originally Posted by Chino View Post
    Is your motherboard running the latest BIOS?
    No it's not, it's running the version that it was shipped with. Is that something worth doing when it's been working for months on this version? Never in my life have I needed to update my BIOS, so I'm a little concerned.

  6. #6
    Moderator Array Nate152 PC Specs
    Nate152 PC Specs
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    Hi midiout

    I was using two 680's in sli with the original bios but seeing how both components work but not together you could try a bios update.

    You are connecting both the 6-pin and 8-pin pcie power cables correct?

  7. #7
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    Quote Originally Posted by Nate152 View Post
    Hi midiout

    I was using two 680's in sli with the original bios but seeing how both components work but not together you could try a bios update.

    You are connecting both the 6-pin and 8-pin pcie power cables correct?
    Sorry I've been brushing this off for a few days out of frustration.

    I've now updated my BIOS to the latest version and it hasn't fixed the problem, and yes I'm using both the 6 and 8 pin connectors, and they're plugged in well.

  8. #8
    Moderator Array Nate152 PC Specs
    Nate152 PC Specs
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    Thank you for the update.

    Make sure the 780 is fully seated in the pcie slot and try using different monitor cables with one monitor for now.

  9. #9
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    Quote Originally Posted by Nate152 View Post
    Thank you for the update.

    Make sure the 780 is fully seated in the pcie slot and try using different monitor cables with one monitor for now.
    Yeah I've also tried that. So far I've:

    • changed the DVI cables for new ones.
    • I tried HDMI with various cables.
    • replaced the PCI power cables.
    • pluged the PCI power cabled into a different slot on my powersupply.
    • replaced the powersupply for another one.
    • card is seated as well as it could be.
    • cleaned the PCI-E slot with compressed air.
    • cleaned the video cards connection point with isopropyl alcohol.
    • updated the BIOS


    It still isn't working on this PC, but works on my old computer. Yet my old video card is working in this PC. Just to reiterate lol

  10. #10
    Moderator Array Nate152 PC Specs
    Nate152 PC Specs
    MotherboardROG Maximus IX Code
    Processori7-7700k 5.2GHz Delidded
    Memory (part number)16GB G.Skill Trident Z 4025MHz 17-17-17-39-2T
    Graphics Card #1Titan Xp - EKFC waterblock
    Graphics Card #2Titan Xp
    Sound CardROG SupremeFX 2015
    MonitorHP ZR30w
    Storage #1Toshiba OCZ VX500 256GB
    CPU CoolerSwiftech Apogee GTZ
    CaseThermaltake Armor+ VH6000
    Power SupplyEVGA Supernova 1600w Titanium
    Keyboard Cyberpower Skorpion K2
    Mouse Razer Basilisk
    Headset Sennheiser HD6XX / Modmic 5
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    Accessory #2 Koolance ERM-2K3U
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    Yeah that is a strange problem, both are compatible and should work together.

    Have you updated to the latest NVidia driver ?

    And have you tried both monitors separately ?

    What code does the motherboard give you when you try to boot with the 780 installed?

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