This model won't be compatible with the B450 ASRock platform.
This model won't be compatible with the B450 ASRock platform.
Confirming your setup: is the monitor linked to your GTX 1660 Super graphics card? Are the 24-pin ATX, 8-pin EPS ports and the graphics card cable correctly connected? Have you attempted to boot with just one stick of RAM?
The processor type doesn't support video output by itself. Therefore, posting isn't possible without a graphics card in the system. You must use a videocard to enable posting. It's not recommended to bootloop without the GPU, but it can only POST when the GPU is present and the monitor is connected.