Monitor won't wake up after sleep

Hello guys,
I built my PC a few weeks ago and since then I am struggling with a problem.
When my PC wakes up from standby mode the monitor stays off and does not wake up anymore.
I have already reinstalled all drivers and tried it with other GPU but without success.
I tried these instructions, it only worked once, but after reboot the problem was back: Monitor Won't Won't Turn On Waking From Sleep
Also via HDMI connection and Smart TV is the same problem. And I changed bios so often until my system did not boot, so I reinstalled it. Have tried everything I found in the forum but did not help. Does anyone know maybe a solution?

Thanks for the answer. I already tried this manual. that does not help.

Below mentioned fix/steps solved my problem on HP laptop:

To resolve this issue, perform the following steps:

Uninstall the graphics driver from the device manager.

1. Start Control Panel, click Hardware and Sound, and then click Device Manager.
2. Expand the node that represents the type of device that you want to uninstall, right-click the device entry, and click Uninstall.
3. On the Confirm Device Removal dialog box, click OK to start the uninstall process.
4. When the uninstall process is complete, remove the device.

NOTE: On the Confirm Device Removal dialog box, click the Delete the driver software for this device option to delete the driver package that was used for the device.

Hopefully, it works for you as well.

Msi have a bug with b450 motherboards with latest bios the sleep dont work.
-https://forum-en.msi.com/index.php?topic=325322.0