Best Buy: XFX AMD Radeon RX 580 GTS Black Edition 8GB GDDR5 PCI Express 3.0 Graphics Card Black RX-580P8DBDR
Asus RX580 Strix - short circuit board? No Signal, boots normal however (while connected to integrated GPU) Led on the top shows white, so the input is "okay" : r/AskElectronics
Black screen after installing RX 580 8GB. HELP !!! : r/macpro
SOLVED] - RX 580 8 GB - Random No Signal - Please Help | Tom's Hardware Forum
ASUS RX 580 4GB - no signal output, but fans spin and keyboard lights work (im in windows but black screen)? | TechPowerUp Forums
Best Buy: XFX AMD Radeon RX 580 GTS Black Edition 8GB GDDR5 PCI Express 3.0 Graphics Card Black RX-580P8DBDR
MOUGOL Original Radeon RX580 8G Graphics Card GDDR5 Memory Video Gaming Card PCIE3.0x16 HDMI DP*3 for Desktop Computer AMD Card - AliExpress
Mac Pro Mac Pro 5,1 Mojave, Sapphire RX580 no HDMI video | MacRumors Forums