Colin FosterBy Colin Foster

Updated November 2026

A line in your laptop display is usually a clue, not a death sentence. In most cases you can work out whether the problem is software, the connection between the screen and the motherboard, or the panel itself within about 15 minutes. This guide shows you how to isolate the cause and which fix to try first.

Step 1: Check whether the line is on the screen or in the image

Start by determining whether the line belongs to the display hardware or to what the computer is sending. Connect an external monitor through HDMI or USB-C and look at the same content. If the line is still missing from the external screen, the laptop’s graphics output is fine and the problem is in the internal panel or its cable. If the line appears on the external monitor too, the fault is in the graphics driver, the video output, or the software showing the image.

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Step 2: Tell software glitches from hardware faults

Lines that appear only in certain windows, after a driver update, or when a specific app is open usually point to software. Restart the laptop, boot into Safe Mode, and update or roll back your graphics driver. Lines that are constant across the boot screen, the BIOS, and every app are more likely hardware. Note the line’s color, its position, and whether it moves or flickers. A vertical line that stays put across the full width of the screen often indicates a ribbon cable or panel problem, while a short horizontal segment can point to a failing portion of the panel.

Step 3: Work through the most common causes

  1. Corrupt or outdated graphics driver. Reinstall the driver from the laptop maker’s support site or the GPU manufacturer’s download page.
  2. Loose display ribbon cable. The thin cable running from the motherboard to the top of the screen can loosen from vibration or a hinge that has been opened and closed many times.
  3. Damaged ribbon cable. Cables that are pinched or bent sharply at the hinge can develop breaks that show as lines.
  4. Pressure or impact damage to the panel. A bump or pressure on the lid can crack internal layers and produce lines that stay in one place.
  5. Failing LCD or OLED panel. Lines that spread, multiply, or appear with heat often mean the panel itself is wearing out.
  6. Faulty GPU or video output. Lines that appear on both internal and external screens often come from the graphics chip or its output path.

Step 4: Try the fixes in order of effort

Begin with the free fixes and move down the list only if the line persists. Update or reinstall the graphics driver first, then reseat the display cable with the laptop powered off and unplugged. If the line changes when you gently flex the lid near the hinge, the cable is the likely culprit and a technician or replacement cable is the right fix. If the line appears on the external monitor too, a graphics repair or motherboard service is usually needed. If the line tracks with panel pressure or has been present since a drop, plan on a replacement display panel.

When to stop and get help

If the laptop is under warranty, contact the manufacturer before opening the case, since disassembly can void coverage. For a hinge-area cable fault or panel replacement, a qualified repair shop can usually complete the job faster than a first-time DIY attempt.

  • A spare HDMI cable and a USB-C to HDMI adapter. These let you test whether the line appears on an external monitor, which quickly separates panel faults from graphics faults. View on Amazon
  • A small Phillips screwdriver set with plastic spudgers. Useful for opening the bezel to inspect the ribbon cable without scratching the case. View on Amazon

Common mistakes to avoid

  • Assuming a line is always hardware before checking an external monitor and driver.
  • Pressing on the screen to see if the line moves, which can worsen panel damage.
  • Forcing the hinge open wider than the design allows while inspecting the cable.
  • Skipping a driver reinstall because the laptop looks fine in Safe Mode.
  • Replacing the panel before confirming the ribbon cable is not the cause.

For related symptoms, see Vertical Black Line on Laptop Screen: 6 Causes and Fixes That Work, Laptop Screen Black Lines: 6 Causes and Fixes to Try First, and Green Line at Bottom of Laptop Screen: 6 Causes and Fixes. If the screen fails completely rather than showing lines, Dell Laptop No Screen Display: 6 Causes and Fixes to Try First covers that scenario.

FAQ

Can a line on my laptop screen fix itself?

Software-related lines sometimes disappear after a driver update or restart. Lines caused by a cable or panel fault almost never resolve on their own and often get worse over time.

Is a line on the screen expensive to repair?

The cost depends on whether the fault is a loose cable, which is usually simple to fix, or a damaged panel, which requires a replacement. Get a written estimate from a repair shop before approving work.

Does a line on the screen mean my laptop is about to die?

Not necessarily. A display fault affects only the screen and its connection, though a motherboard or GPU problem can cause similar symptoms, so check the external monitor test first.

Conclusion

Test the internal screen against an external monitor, then update or reinstall the graphics driver before touching any hardware. If the line stays, focus on the ribbon cable and hinge, and consider a panel replacement only after those are ruled out. Work through the causes in order and you will usually know the real problem before spending money on parts.

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Colin Foster

About Colin Foster

Colin Foster is part of our editorial team and reviews and edits our consumer tech how-to & troubleshooting guides, checking product details against manufacturer specifications and owner feedback.