Restart the laptop
Check if the lines appear in BIOS or startup screen
Connect the laptop to an external monitor
Update or reinstall the graphics driver
Roll back the graphics driver if the issue started after an update
Adjust the screen resolution and refresh rate
Reseat or inspect the display cable if accessible
Check for loose or damaged screen connections
Run the laptop display diagnostics
Test for physical damage to the screen
Remove recently installed software or updates
Boot into Safe Mode and check the display
Update the laptop BIOS or firmware
Power reset the laptop
Replace the LCD panel if the lines persist
Repair or replace the display cable if faulty
Contact a technician if the issue continues