My mobo is a DZ77BH-55K I have just recieved my RMA'd 7950 and i am still having the same issue as i was getting with my first card. I hook everything up double check every cable and make sure its fully in the PCI slot, when i go to boost up my computer i get nothing. no power to mouse, keyboard, and no response from my monitor. i have tried two different DVI cables plus a HDMI cable. still nothing. i have looked around for possible solutions but cant really come to any answers. the numbers that were being displayed on my mobo were 28,31,51 during all testing. not sure if that helps but im not 100% technically inclined so bare with me on this please. ill try and give as much info as i can.