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Screen does not come back after using screen lock. What can I do?

Try the following:

1. Try reconnecting and end the connection properly.

2. Remove monitor's driver.
① Reboot to safe mode.
A. Reboot the PC
Press "F8" to get to the boot menu.
(repeat if necessary.)
※ Some PC uses "F5" or "Delete" to get to the menu.
B. Select Safe mode [with networking] and press enter.
C. Windows will boot into safe mode.

② Launch Device Manager. (Windows key + R > mmc devmgmt.msc)
Pic. 11
③ Remove monitor driver.
Select the item and press Delete key to remove.
Pic. 12
④ Reboot the PC.