Green Lines on Your Screen: What Causes Them and Can You Fix It?

A thin green line is usually caused by the display panel itself or the cable that connects it, though a driver problem is possible. Check an external monitor: if the line isn't there, the panel or its cable is the likely cause, and it usually means replacing the panel.

Check it now with the green screen test

Fixes to try (easiest first)

Check with an external monitor
If the green line shows on the external monitor too, the panel probably isn't the problem. [1]
Update the graphics driver and BIOS, then restart
Corrupted graphics drivers can cause lines on the screen. [2]
Run the built-in LCD test
On Dell laptops: hold D and press power. If the line shows on the solid colors, the LCD may be faulty. [2]
Monitors: reseat or replace the cable
Make sure the cable is firmly in at both ends with no bent pins, then try a known-good cable. [3]

Is it worth fixing?

Option	Price
PartsReplacement screen. Part only on iFixit, labor extra. Price depends on your model.	$34.99–$1,385.99 [4]
PartsReplacement screen cable. Part only on iFixit, labor extra. Price depends on your model.	$24.99–$37.99 [5]

If the line is only on the built-in screen and shows during the LCD test, a faulty panel usually needs replacing. A faulty cable or loose connection can also cause it. Check your warranty first, then get a repair quote.

Repair or replace? Try the calculator · Not sure this is your problem? Take the quiz

Sources

Last checked: October 21, 2026