OK, PC running Windows 7, until recently equiped with a GTX 570 driving dual DVI displays. Now changed to Radeon R7790, my first time with a card from the red team. I'm only getting one of the display showing anything. I switched the cables over and found that both displays can work OK, but again only one at a time (hope that is clear). So apparently the problem lies with the new card. I'm not familiar with the Catalyst software and drivers. I've used Catalyst Control Centre to automatically detect the card and download the correct drivers (no change). I've also used the 'Detect Displays' option both manually and automatically but still only one is found. I'm thinking there is a hardware fault with the new card. Before I RMA it, is there anything else I should try? (And let's not get sidetracked into why the apparent hardware downgrade, I just thought I'd explore alt-coin mining for a change from protein folding).