your setup, smart phone or any else devices should go to sleep whenever it is told to.
However, the problem is many people are complaining that their monitor not going to sleep Windows 10.
This is an annoying thing, but it is not difficult to solve.
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just get to know the methods and the detailed steps clearly.
How To Change Primary Monitor On Windows 10?
You are advised to safely remove USB rig from computer or other devices.

Do you really need to do so?
You should go to check & change the power plan and sleep tweaks manually.
Monitor Wont Turn On When You Start Dell/Samsung/HP Computer.

How to Change Power Plan
How to stop monitor from going to sleep?
kindly select Never for Turn off the display and Put the computer to sleep.
#3.

Disable USB Selective Suspend
When your monitor wont sleep Windows 10, you should also change another setting.
#4. fire off the Power Troubleshooter
How to fix when Windows 10 display never turns off?
yo initiate the Windows built-in troubleshooter.

What else to do when your Windows 10 monitor wont sleep?
c’mon check for apps running in the background that will prevent the monitor from going to sleep.
Also, you should probably check for the system sleep blockers.
In addition, you may give a shot to update the latest drivers or view the event logs.
How to turn screen off Windows 10?