Hahahahahaha0

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?