the lighting up on bios is a good sign, sometimes i get one card that doesnt light. a quick reboot and its back.
check you risers - these were the main cause of my problems
have u installed the chipset drivers for the mother board?
PITA - Pain In The Arse
The board came with UEFI v 2.0. I haven't touched drivers for the board yet. In fact I completely forgot about the fact that motherboards use drivers I was so preoccupied with my GPU drivers lol. I'll check that tonight.