CrackMacLeft or right side of your MacBook screen black or flickering? Here's why
A black, flickering or glitchy band down one side of a MacBook screen almost always means the panel is damaged along that edge. Pressure near a corner or a knock is the usual cause, even if the outer glass looks fine. The rest of the display often keeps working normally for months, so you have time to decide what to do.
Not ready to pay for a repair? If the damage sits along an edge, you can block off the broken part and keep using the rest.
Confirm it's the panel
- Take a screenshot with Command-Shift-3 and open it on your phone. If the screenshot is complete, the Mac is drawing the whole picture and the panel isn't showing part of it.
- Connect an external monitor. A clean picture there rules out the Mac's graphics.
- Look closely at the edge of the band. A sharp, straight edge means a block of dead columns. A ragged edge with fine lines running from it means a crack inside the panel.
Why it's a strip and not a spot
An LCD is a grid. Each column of pixels gets its signal from connections along the panel's edge. When a crack or pressure damage cuts those connections, every pixel in the affected columns goes dark at once, so the damage shows up as a stripe running the full height of the screen, sometimes several centimetres wide.
Black, flickering or growing?
| What you see | What it usually means |
|---|---|
| A stable black band | Dead columns. Often stays the same for a long time. |
| A band that flickers or shows static | A damaged but not fully broken connection. Can settle down or spread. |
| Coloured lines next to the band | Columns that are partly damaged. Often the next to go dark. |
| A band that widens every few days | A crack that's still spreading. See will it get worse. |
What you lose on each side
The left edge is the worse one to lose. It hides the Apple menu, the current app's own menu, and the close, minimise and zoom buttons on every window. Command-W closes a window, Command-M minimises it, and Control-F2 reaches the menu bar from the keyboard. More in menu bar missing.
The right edge hides menu bar icons, the clock, Control Center, notifications and every scroll bar. Two-finger scrolling still works, and Command-Space opens Spotlight for most things you would otherwise click in the menu bar.
If the damage runs along one edge, CrackMac can keep windows, menus and the pointer off it. There's a free 30-minute trial.
Repair or keep going?
A new display costs a few hundred dollars, $99 with AppleCare+. The breakdown is in screen replacement cost. On an older Mac, or when the band is narrow and stable, plenty of people keep using the rest of the screen instead.
Quick answers
Why is the left side of my MacBook screen black?
Usually because the panel was damaged near that edge, often by pressure on the corner or a knock. The rows and columns of an LCD are fed from its edges, so damage there cuts out a whole band. The Mac itself is normally fine.
Can a black strip on a MacBook screen fix itself?
Not when it comes from physical damage. A strip that appeared after a knock stays, and often widens over weeks. Flicker that comes and goes with the lid angle points to the display cable instead, which a repair shop can replace.
A dead strip down one side?
That's the exact case CrackMac was built for, on a MacBook Air with a dead band down its left edge. It blacks out the strip, stops windows and the pointer at its edge, and redraws the Apple menu where you can reach it.
- Works on macOS 13 or later, Apple silicon and Intel.
- Free for 30 minutes of use, then a one-time price. No subscription.
- A refund within 7 days, no questions asked.