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So I recently bought a 7870xt and a evga 500watt psu. I installed both of them, and the computer turns on. All the fans spin, but it doesn't post or show any image on the monitor. I replaced my GPU with my old GTS 450, and it boots perfectly. But when I put in the 7870xt, it doesn't beep, or show any image. I know the PSU works, and I know everything else works, but when I change the GPU, it just doesn't display anything. Any help is greatly appreciated. Also have tried multiple monitors.

i5 2310 quad core
MSI P67-c43
8gb of RAM