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Radeon 6870 not outputing video

Last response: in Graphics & Displays
June 22, 2012 4:39:17 PM

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?