I have a problem with my monitor screen. Message 'control lock' always poping up. How to get rid of this? Please help me

Try holding the menu button on your monitor for 10 -20 sec to see if this will unlock it

If this does not work, what monitor do you have?

try holding the menu button on your monitor for 10 -20 sec to see if this will unlock it

if this does not work, what monitor do you have?

Thank you 4 your advice. It is true. Monitor problem. I tried to change the monitor and it worked. Thanks again