A dark blotch appeared after the screen was knocked
Why does my laptop screen have a dark blotch after being bumped?
Written by The CommonFixes team · fact checked by CommonFixes review desk
Last updated
Short answer
The picture itself comes from a thin liquid crystal layer between two sheets of glass. Pressure or impact cracks the inner sheet, and the fluid pools or leaks into the damaged area. That is physical damage to the panel, not a software fault, and it cannot be repaired by settings. The quickest thing to try first: prove it is the panel, not the graphics — Plug in an external monitor. If the external screen is perfect while the blotch stays on the laptop, the panel is damaged. If the blotch appears on both, it is the graphics chip instead. Most people are done in about 15 minutes.
Full walkthrough below: 6 steps for Windows and Mac, rated careful.
Sounds like this
- •A dark cloud or spreading stain in one area
- •Coloured lines radiating from a point
- •The rest of the picture is normal
Why it happens
The picture itself comes from a thin liquid crystal layer between two sheets of glass. Pressure or impact cracks the inner sheet, and the fluid pools or leaks into the damaged area. That is physical damage to the panel, not a software fault, and it cannot be repaired by settings.
Work through these in order
0% done- 1
Prove it is the panel, not the graphics
Plug in an external monitor. If the external screen is perfect while the blotch stays on the laptop, the panel is damaged. If the blotch appears on both, it is the graphics chip instead.
- 2
Photograph it now
Take a dated photo. Blotches spread over days and an early image matters for warranty, insurance or resale conversations.
- 3
Stop pressing or opening by a corner
Lift and close the lid from the centre edge only, and never place anything on a closed laptop. Continued pressure widens the crack quickly.
- 4
Check accidental damage cover
Look at your warranty terms, your card purchase protection and your home contents insurance. Accidental screen damage is often covered even when the standard warranty excludes it.
- 5
Price a panel replacement
The panel is a separate part from the rest of the laptop. Quote a screen assembly replacement from an authorised repairer before assuming the machine is finished, since it is frequently a modest job on mainstream models.
- 6
Work on an external monitor meanwhile
Connect a monitor or TV over HDMI or USB-C, then press Windows and P and choose 'Second screen only'. The laptop stays fully usable while you decide.
If none of that worked
Do not try pressing the blotch out or applying heat. Both are widely repeated online and both make the leak larger and permanent.
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Who wrote this and how we checked it
The CommonFixes team
Writer and researcher
We are a small group of people who spend our days repairing laptops and desktops for family, friends and small offices. Every guide here starts with a problem someone actually brought to us, and we only write down the steps that put the machine right.
- Everyday repairs
- Windows and Mac
- Plain language
CommonFixes review desk
Technical editor
Before a guide goes live, a second person walks through it on a real machine and checks each instruction against the maker's own support pages. Anything we cannot confirm is removed rather than guessed at.
- Fact checking
- Safety warnings
- Source links
This guide was last updated on 10 August 2026. If a step no longer matches what you see on screen, tell us on the contact page and we will test it again.
A gentle reminder: back up anything you cannot afford to lose before major repairs. If a step ever feels risky, stop and ask a technician. There is no shame in that.