First post, found this place through trying to troubleshoot my issue. It's very similar to this post:
Mobo: Asrock Z97M Pro4
GPU: Sapphire R9 280x
PSU: Corsair CX600
My R9 280x works in my roommate's computer, but does not work in mine. The card is not even detected in the BIOS or shows up in Window's device manager. My roommate's 970 and my old r9 270 both worked fine in my PC. The card's fans spin and it does light up.
Here are the things I have tried so far:
Removed old video card drivers, amd catalyst couldn't find an amd card to install drivers for
Updated motherboard bios
Updated motherboard drivers
Reseated card several times
Made sure that the motherboard graphics output is PCI Express
The only thing I can think of is something with the power supply. Newegg says 750W is required, but other threads say that 600W should be more than enough for just a single card. However, maybe one of the 4 "add-on" power supply pins is broken. But if that were the case, I wouldn't expect the fans to power on. Really at a loss at this point, just trying to cast as large of a net as possible in hopes that someone can help me out.