Hello. As I mentioned in the name of thread. My problem is, that I'm using a single monitor (LG 22MK400A) using DP -> VGA. The monitor will not recieve any signal until Windows is booted. On my previous GPU (Sapphire RADEON HD6750) it worked, but since i bought new PC with Sapphire PULSE RX560 4G (45W). Do you have any ideas how to fix it? On my MB (MSI B450 TOMAHAWK) i tried to use the Windows WHQL thing but then my HDD (Seagate BARRACUDA 1TB) will not be included in the boot process. I tired to contact the LG Support, but they only told me, that the DP -> VGA adapter is causing it.