Radeon 6870 not outputing video

I'm trying to install a Radeon HD 6870 GPU. When I change to the PCI-E for the vga output in my BIOS I don't get any display. But the GPU is detected by my motherboard and shows up in CPU-Z and Speccy. In Speccy it shows up as AMD Radeon HD 6800 Series (Undefined). I've installed drivers.

What do?
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  1. I read this thread: http://www.tomshardware.com/forum/327160-33-sapphire-radeon-6870-video-stuck-boot

    Is it possible that my mobo and GPU aren't compatible?

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