Press and hold Power button for 20–30 seconds
Release it
Wait 10 seconds
Press Power again to turn it on
Hold Power button to turn off.
Turn it on.
When Windows logo appears → force shut down again.
Repeat 3 times.
It will enter Automatic Repair.
Then go to:
Advanced Options
Startup Settings
Restart
Press 4 for Safe Mode
If it works in Safe Mode → it's driver or startup app issue.
Connect to:
HDMI monitor or TV
If external monitor works → internal display issue. If both blank → Windows issue.