Its difficult to discribe. Its like a pink pixeled screen flashing up for some seconds before the "mainboard logo" is showing up.
here you can see it Rx480 Red devil - YouTube
Also i got performance issues , all drivers are up to date
MY PC (Windows 10)
Mainboard : Asus M51AC
CPU : i7 4770-S
Ram : 8GB DDR3
GPU : RX480 Red devil