Here's another thread about how I can't get my Crossfire to work properly. As far as I know, I've tried just about everything to fix the issue but I'm stuck.
I just finished my rig today (for the kickoff of Crysis 3!) and I'm Crossfiring two of them in the rig in my signature. After less-than-expected results with the graphics, I started to wonder if by chance only one of my cards was doing work. Turns out I was right, and Windows/CCC cannot recognize my second card. Even worse, my BIOS can't even recognize there being a second graphics card in the board. Everything is under water, and thankfully I at least know the card is working because my Komodo waterblock light comes on. I've reinstalled AMD Catalyst twice and downloaded the latest CAP files. Both cards are getting power, and I even went so far as flipping the Crossfire bridges backwards.
At this point, am I looking at a motherboard RMA situation?