Dual displays not working

I have a Hackintosh with a 5700 XT installed. It has been working flawlessly since I built it. However today when I started it up one of the displays is not working. It's just black. The OS recognises that it is there, but there is nothing displayed on the screen. It's also still working in windows, so it's not a cable problem. I have tried all the usual stuff like unplugging it and plugging it back in. I have reseated all the cables, nothing. I am stumped by this, does anyone have any suggestions?

EDIT: There have been no changes made to the system or new software installed. It was working fine a couple of days ago.

Thanks

submitted by /u/timblewee
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