Only one video card works when both are in (980 GTX)

I have a dual 980 GTX setup. I had a dual screen setup and My monitor went out so I set my cards up to be SLI I had this setup for a while and everything was fine. Now, My computer only detects one video card in. I went through the troubleshooting steps and verified all my components work.

1.) Tried card 1 in PCI-E slot 1. Worked
2.) Tried card 2 in PCI-E slot 1. Worked
3.) Tried card 1 in PCI-E slot 2. Worked
4.) Tried card 2 in PCI-E slot 2. Worked
5.) Tried card 1 in slot 1 and card 2 in slot 2. Card one worked, and card two gives "DVI No Signal"
6.) Tried card 2 in slot 1 and card 1 in slot 2. Card two worked, and card one gives "DVI No Signal"
7.) Interchanged power cables between steps and also tested voltage according to pinouts. Everything checks out.

Device manager only reads my onboard Intel graphics 4600 chip and one GTX 980s. This one has me stumped.

Also I have a Z97x-Gaming 3 mobo, and a Corsair 1200 watt PSU.
Reply to Tony LeRoy
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More about video card works 980 gtx
  1. If its running in SLI, thats normal. Only the primary card should be used for video output in a SLI config.

    Try disconnecting any screens from the second card and the integrated graphics, then boot the computer like that.
    Reply to RobCrezz
  2. RobCrezz said:
    If its running in SLI, thats normal. Only the primary card should be used for video output in a SLI config.

    Try disconnecting any screens from the second card and the integrated graphics, then boot the computer like that.


    I only have one monitor as I tossed the old one when it went out. Probably should have stated that. Sorry.
    I hooked the cards back up and I put the bridge back on as I first had it when I noticed this issue. Is there a way to get them out of SLI just to be sure that both cards are being read? In the device manager and the Nvidia Control Panel I am only seeing one card as stated. No SLI tab anymore

    And thanks for the reply. Still new to dual graphics card setup.
    Reply to Tony LeRoy
  3. Do you have any other PCI-E cards except for the graphics cards? How about any m.2 drives or devices?
    Reply to RobCrezz
  4. Nope, the only two PCIE cards I have are my graphics cards and they’re the only two PCIE slots being used. The third is empty. I can’t fit anything into it though since it doesn’t have that much clearance due to the closeness to the PSU
    Reply to Tony LeRoy
  5. Try resetting the bios to defaults. Check its not forcing one slot to x16 mode (you need to be running in 2 8x 8x for SLI).

    If still no good, try a bios update to the newest one.
    Reply to RobCrezz
  6. RobCrezz said:
    Try resetting the bios to defaults. Check its not forcing one slot to x16 mode (you need to be running in 2 8x 8x for SLI).

    If still no good, try a bios update to the newest one.


    I’ll try this when I get home. For some reason in my bios I cannot set the lanes manually. I haven’t changed anything on the bios since I’ve had my pc (3 years) so I’ll look more in depth on this
    Reply to Tony LeRoy
  7. Tried to update the bios, and I got an error in the qflash utility and it said "no drive found". I set my bios to default and got the no operating system error so I messed with the boot order and got it working. Still no second card found
    Reply to Tony LeRoy
  8. RobCrezz said:


    Thanks for the link. Downloaded, ran, updated bios to F7. Still no second card.
    Reply to Tony LeRoy
  9. Have you tried disabling the Integrated graphics in the bios?
    Reply to RobCrezz
  10. RobCrezz said:
    Have you tried disabling the Integrated graphics in the bios?


    Sorry for the late reply. I've been working and have classes as well. That didnt work. that just left me with one card detected haha. my 980 gtx. I re-enabled them again
    Reply to Tony LeRoy
  11. Sorry, im out of ideas. Not sure why the second card isnt being detected.
    Reply to RobCrezz
  12. Still havent got this figured out. any more ideas?
    Reply to Tony LeRoy
  13. UPDATE:

    So in my current setup now, I have my top card working. I unplugged my top card from the PCIE slot and connected my monitor to my bottom card and IT DID NOT WORK. I swapped power cables and it worked. So I placed my TOP card back in and hooked the supposedly bad power connector into it, and it actually worked. now my bottom card is not being detected over again.
    Reply to Tony LeRoy
  14. Ok so sounds like potentially bad PSU or power cable?
    Reply to RobCrezz
  15. Update #2 I uninstalled all my NVIDIA drivers and swapped cards. I had to uninstall a second time. I reinstalled drivers and I can now see both cards
    Reply to Tony LeRoy
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