Z77 Extreme 3 and XFX HD 7970 Help !?

[Sonny330i]

Hello Guys

I have a big Problem. I have bought a new XFX 7970 today, but the Motherboard dont find the 7970. Different thinks i have tryed:

- BIOS Update to new 1.50 Version
- Catalyst Driver reinstall and new install it again. Again install works not because the Mainboard dont find the 7970.
- Other PCI Slot

Nothing will works for me :(

Can anyone Help me please ?

Sorry for my bad English. Im from from Germany :D