So I am building my first PC and while I thought I knew everything to do from part swapping in the past, I can't get my GPU to work. I have tried both PCI-E slots and made sure it was plugged into the PSU but nothing works. The fan doesn't turn on and I get nothing on my monitor. Everything else seems to power on like case leds, fans, and my heatsink. I sent the last one back thinking it was defective so I doubt the new one is as well (although possible). Any advice?
GPU: Sapphire HD 7770
PSU: RX-600AF
MOBO: Gigabyte 970A-D3
GPU: Sapphire HD 7770
PSU: RX-600AF
MOBO: Gigabyte 970A-D3