I'm trying to upgrade to a Radeon RX 480 card. I've upgraded the PSU to a 600 W Corsair. I've been running a XFX Radeon 6950 with no issues. I've had the 480 working in another machine so I know the card is fine. I'm wondering if the 480 is even compatible with the motherboard. I can't find information on its compatibility.
I believe that your problem is caused by the fact that the RX 480 requires UEFI in the motherboard instead of a Legacy/standard BIOS. HP didn't begin using UEFI until mid-October, 2012. The BIOS can't be upgraded to UEFI. I suggest that you contact the manufacturer's Tech Support to see if they can help you with a VBIOS update for the card that will allow it to work with UEFI.
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