Why is my laptop not recognizing my external monitor after disconnecting and reconnecting it?

< 1 min read

Check the connection cable:
Make sure the connection cable between your laptop and the external monitor is working correctly.
Reinstall the drivers:
Uninstall or reinstall the display driver on your laptop.
Restart your laptop:
Reboot your laptop or shut it down and restart it after a few minutes.
Check the power settings:
Make sure the power saving settings in either Windows or macOS are turned off.