I've had problems like this and what i did was to remove the card and then put it back in then connecting the power leads (yours doesn't need any so skip that part) then hooking my monitor back up with the DVI ti VGA adapter.
I'd also trying loading your PC up with the 5670 taken out and you using onboard graphics if possible. Then going into the bios use the option of setting it to fail safe defualts but set the PC up to goto pci-e graphics not onboard graphics and after that shut the pc down before installing the new card again.
If that fails all i can think of is that you have a defective card.




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