Fedora should just be picking it up in boot, so I'm sensing there is something up with that card.
The way hardware detection works on boot is by getting the deviceIDs and paths first, then loading the driver. From your logs it seems that the first part is done, but then on loading the driver's the card "goes away" when engaged by the drive being loaded. I would guess a possible power issue.
Are you running an APU at all, and does your motherboard also have video output, or just the GPU card?