The UEFI /BIOS was downloaded from the ASRock website. I downloaded the graphics driver from ASRock and also AMD. The driver was installed with Admin rights.
The version of Windows 10 was the problem. I had Windows 10 Pro - Version 1511 Build 10586.494.
After your post I manually updated Windows...
I have an ASRock B450 Gaming-ITX/ac motherboard. I installed a Ryzen 5 4600G CPU. This is installed in a COOLERMASTER lite 130 Mini-ITX case. The 4600G is listed as compatible with the ITX board. I upgraded the BIOS to 4.40 as recommended on the ASRock website. I installed Windows 10 and...