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So I have an Asus P8Z77-V DELUXE, 32 GB of ram, a 2 TB WD HDD, core i7 3770k and 2 Sapphire 280X GPUs. I had them in crossfire so I hadn't noticed for how long it's been going on but one of my GPUs is detected in AMD settings MSI afterburner I can even do some mining on it but I can't get it to display anything. I've tried 3 different HDMI cables ( that I know are fully functional ) as well as DVI cables but my monitor keeps saying no input. Any ideas what could be wrong? 

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Are you doing this with CrossFire enabled? I have no hands-on experience with AMD cards, but if it's the same as SLI then output is handled by the top/main card only.

Crystal: CPU: i7 7700K | Motherboard: Asus ROG Strix Z270F | RAM: GSkill 16 GB@3200MHz | GPU: Nvidia GTX 1080 Ti FE | Case: Corsair Crystal 570X (black) | PSU: EVGA Supernova G2 1000W | Monitor: Asus VG248QE 24"

Laptop: Dell XPS 13 9370 | CPU: i5 10510U | RAM: 16 GB

Server: CPU: i5 4690k | RAM: 16 GB | Case: Corsair Graphite 760T White | Storage: 19 TB

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