I tried it differently. The first start-up with integrated graphics and the first start WITHOUT the built-in graphics. Anyway, a cyclic reboot.
It turned out to configure with a connected monitor. But it is necessary without a monitor.
Everything worked perfectly on NVOS 19.2, what is wrong with this system?

I launched it. But overclocking does not work. What do you advise?

The problem was in the line
HEADLESS_MODE="YES"                 # YES or NO # If using P106_100, P104-100 GPU's in a full headless (no monitor) rig, set this to YES

Hello!

There are several farms. On motherboards ASRock H81 Pro BTC R2.0, 6 Nvidia cards 106-100 6GB. They started and work.
There are also farms on the H110 Pro BTC boards with 12 cards 106-100. Here is a problem with them. When I start LOCAL (the monitor is connected to the integrated graphics) I get a cyclic reboot. Xorg PROBLEM DETECTED Restorting Xorg ....
Without a monitor, through SSH, the miner does not start, when you try to run bash 2unix, it reboots again ... and does not work.
How to fix?

I speak English poorly, I write through Google)))