System won't POST after installing Radeon HD 6990

munny

TS Rookie
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!
 

munny

TS Rookie
I upgraded my board to an intel board with a core i5, and ddr3 ram. and card runs fine. Not sure what system component it didn't like before, but i lead towards the MOBO although it certainly was on AMDs approved list...

Thread solved