My laptop has a black horizontal line. How do I fix it?
GeneralClass 10CBSEAnswered 25 May 2026
Answer
Step 1
Diagnose hardware vs software: connect your laptop to an external monitor.
- Line appears on external monitor too → problem is with graphics card or driver, not the screen
- External monitor is clear → problem is the laptop's screen, cable, or connection
Step 2
If it is a screen/cable issue (most common cause):
The most frequent cause is a loose or damaged LCD cable the cable connecting the display to the motherboard, which runs through the hinge. Repeated opening and closing wears it down.
What to try:
- Gently flex the screen at different angles — if the line moves, changes, or disappears, the cable is loose or damaged
- Update your graphics drivers (worth trying if the line appeared suddenly)
- If under warranty, claim it a screen line is a hardware defect
- If out of warranty, a technician can replace the LCD cable (inexpensive) or the screen panel (more expensive)
Do not press on the screen if it is an LCD panel crack, pressure makes it spread.
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