Hi Guys! I've had good luck here in the past so Im hoping to get some help again. Here's myy story: I recently bought an XFX Radeon 6990 from Provantage, got the card and installed it in my system, and No dice. I get Fans powering up on it but does not go to post screen. I Feel like I have it fully seated in the PCI slot, both 8pin power connecters are attached I just can't figure it out. I RMA'd the card to XFX and they came back telling me it fully tested ok for them. Now as I wait for it in the mail to return to me Im trying to diagnose what may keep it from working for me. Like I said I feel like it was fully seated. Both power connecters are attached. I tried booting with out any usbs plugged up the system boots just fine with my gfx cards that i am replaceing (2 x 9800gt's ) system boots just fine with a single 9800 gt rest of system components are - AMD phenom 9950 Asus M3N72-D mobo just updated to latest bios tagen 1100w Power supply 8 gigs of ram (4 x 2gig sticks) single HD single dvd rom Windows vista 64 bit any thoughts greatly appreciated!