Your Display Is Garbled
If your display suddenly goes haywire, a number of things could be the problem, but the following four are the most common:
It’s a temporary glitch. This is the usual cause of a wonky display, and you solve it by restarting MacBook Air. Because you can’t see the Mac desktop, the trackpad is no good to you, so you need to use the keyboard. First, press Shift+
+Q to log out. If that doesn’t work, press and hold the Control and keys and then press the power button to force MacBook Air to shut down.
For an external display, there’s a loose connection. If MacBook Air is connected to an external display, check the connection on the MacBook Air, on the monitor, and on both ends of the display adapter, if you’re using one. If any connector is loose, plugging it in properly should fix the problem right away. If not, turn the monitor off and then back on.
The display is using improper settings. If your display somehow gets set to a resolution that it can’t handle, you see ...
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