[SOLVED] Computer will not POST

[QsEfThUkO;08]

Yesterday I got a 5770 for my Mac Pro. I flashed it using my main build and put it in my the Mac Pro I purchased it for, and it worked. Today I reassembled my main build with its usual parts. I turned it on, and nothing happened. No POST, no beeps, blank screen. The fans are on, but nothing ese happens. I have tried removing the RAM, a new PSU, removing the CMOS, and unplugging all unneccessary components. It worked just fine before flashing. Please help me.
Specs:
Ryzen 5 2600
4x8gb Crucial Ballistix DDR4 3000
ASUS DUAL-RX480-O4G
EVGA 500w
XPG Spectrix S40G

 

[QsEfThUkO;08]

Somehow, putting my GPU into the second slot and then back into the first one solved my issue.