So I recently upgraded to a new mother board and got 2 Radeon 7870s from different manufacturers. I think one of them is dead out of the box but is there anything else I can try before I send it back.I have 2 PCI-e 3.0 slots. Tried the bad card on both slots and got nothing in device manager. Monitors hooked up to it don't show anything but the fans run. I tried the second graphics card on both slots and it's detected on both of them in device manager and I get video output. Is there anything else I can try or is this a confirmation that the card is junk and needs to be replaced?