If I ask a question, I need to make sure of something. Getty pissy at me isnt going to make me reply again. The reason I asked about the crossfire cable is, if it was damaged while in use, electronic circuits may have been damaged on the card(s). Luckily that isnt the case. If I was you I'd borrow another crossfire connector in case you have been really unlucky and got another faulty one. The problem isnt that the graphics cards arent working, its that they dont work in crossfire. At the moment I dont suspect any of the electronics hardware, except the crossfire connector and maybe the PSU. It would be nice to see the result of running the 5970 as primary while the 5870 is plugged in if you can manage it.