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Screen on 2nd graphics card not working/not detected

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Joined
Nov 13, 2011
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Motherboard
GA-Z77X-UD5H 10.13.6
CPU
i7 3770K
Graphics
2x GTX 980 Ti
Mac
  1. iMac
  2. MacBook
  3. MacBook Air
  4. MacBook Pro
  5. Mac Pro
Mobile Phone
  1. iOS
Hi everyone,

I have been running High Sierra for a long time with two 980TIs and 3 screens. Out of nowhere the third screen on the second card is not detected. The OS sees the card in Cinema 4D/Octane and System Profiler. All three screen are running when booting Win10.

Does anyone know what the problem could possibly be? It's obviously a software issue but I'm at a loss here...
 
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