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.

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