Review on ASRock Motherboard Motherboards Z370 PRO4 by Mateusz Burzyski ᠌

The motherboard has 4 RAM slots A1, A2, B1, B2 I have 4 planks. And I can install only 2. And only slots B1, B2. The computer works, starts, but DOES NOT BEEP (everything is in order with the buzzer) If you install the RAM in slots A, then there will be no picture on the monitor, the buzzer will not beep either. Cooling is started. The bios says that single-channel mode is working, the RAM is installed in channel B. Motherboard: ASRock Z370 Pro 4 Operation: Kingston HyperX Fury DDR4 4gb 2666MHz Question: how to enable dual channel mode? I installed the RAM in a different order, followed the instructions, ated, reset the bios. Did not help. There is no such DUAL CHANNEL setting in BIOS