I have an ASUS P8Z77-V DELUXE, and it will not boot with my 7950 inside. I have tested the 7950 in 2 other boards, and the integrated graphics (HD 4000 on 3570K) works just fine.
The VGA_LED is ON when the GPU is in the system, but is off when it isn't. I have tested it in other PCI-E slots, and I have tried resetting the CMOS and updating the BIOS. I do not have any other GPUs to test, as my only other one is an AGP card (nVidia 6200 GT) and I cannot test with another PSU as I do not have one. If there is any other information you need to know, please let me know.
The VGA_LED is ON when the GPU is in the system, but is off when it isn't. I have tested it in other PCI-E slots, and I have tried resetting the CMOS and updating the BIOS. I do not have any other GPUs to test, as my only other one is an AGP card (nVidia 6200 GT) and I cannot test with another PSU as I do not have one. If there is any other information you need to know, please let me know.