Sleeping mode with RTX4000

Hy, everyone!
I have a trouble with my new RTX4000 card. When i start/restart the computer, it seems like the monitor does not receive a signal from the card and goes into sleep mode. It turns on only when the desktop is loaded after 30 seconds. And the monitor doesn’t work while BIOS mode activated. It is not a trouble with the monitor, because it works fine with GTX 1060 card on another PC. It is not a trouble with drivers, because i downloaded the newest version of them.
Thanks in advance!