I am having this issue where the monitor will not turn off even though Windows power options are configured for it to turn off after a specified period of time.
In testing, I configured the timeout to 1 minute and waited for the monitor to turn off. The monitor will look like it will turn off, but it turns back on after a few seconds! I also tried third party software to turn off the monitor like nircmd and turn off monitor, but both of these exibited the same behavior. I have also tried running nircmd in safe mode, but once again, the monitor flashes off then on.
In an attempt to diagnose this, I made sure to unplug everything from the PC except for the power and display cable, however, the same thing occurred. Additionally, I have disabled wake timers and wake on lan. There are no game controllers connected the the PC as well.
This issue is extremely puzzling. Everything that I have tried will not solve the problem.
This PC is an HP Compaq 6200 running Windows 10 LTSB 2016.