CrackMacMacBook screen keeps going black for a second, or at random? Here's why
Random blackouts on a MacBook usually come from one of three things. A setting is putting the display to sleep, an external monitor or adapter keeps reconnecting, or the display cable is failing. The lid test separates them. If moving the lid makes the screen blink, it's the cable. If it happens with the lid perfectly still, start with the settings.
Settings that turn the screen off
- Hot corners. System Settings, Desktop & Dock, Hot Corners. A corner set to "Put Display to Sleep" turns the screen off every time the pointer touches it. Set it to nothing.
- Display sleep. System Settings, Lock Screen. Check "Turn display off on battery when inactive" and the same setting for power adapter.
- Screen saver set to a black or blank style looks exactly like the screen turning off.
- Low Power Mode shortens timeouts. Check it in Battery settings.
Monitors and adapters
With an external display, a dock or a USB-C adapter connected, both screens can go black for a moment when the connection drops and comes back. Try another cable or port, or unplug the adapter for a day and see whether the blackouts stop.
The display cable
Open and close the lid slowly. If the screen blinks or goes black at certain angles, the cable that runs through the hinge is wearing. It's well known on 2016 and 2017 MacBook Pros, and it happens on other models after years of use or a knock. It gets worse, not better, so get a quote before it fails completely. See screen only works at certain angles.
Other causes
- Blackouts that started right after a macOS update. Check for the next update, and try safe mode to rule out an app.
- Blackouts when the Mac is hot or busy. Check Activity Monitor for something using the graphics heavily.
- Blackouts in only part of the screen. That's the panel. See screen flickering.
If the damage runs along one edge, CrackMac can keep windows, menus and the pointer off it. There's a free 30-minute trial.
Quick answers
Why does my MacBook screen go black for a second?
Short blackouts usually come from a hot corner set to put the display to sleep, an external monitor or adapter reconnecting, or a graphics switch on older MacBook Pros. Blackouts that happen when you move the lid point to the display cable.
Why does my MacBook screen turn off by itself?
Check the display sleep times in System Settings, Lock Screen, and any hot corners in Desktop and Dock. If those are fine and it still turns off, test whether moving the lid triggers it.
Black only along one edge?
If one strip of the screen blinks or stays black while the rest is fine, the panel is damaged there. CrackMac paints that strip black for good and keeps everything else on the working part.
- 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.