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Why is there a rectangle on my screen Mac?
Cause. A bug in the Mac OS X 10.4. 8 Update causes the preview rectangle to be visible, whether or not Zoom has been enabled in Universal Access preferences, if the following Zoom options are set: Show preview rectangle when zoomed out is selected.
How do you fix a blue screen on a Mac?
How to Get Rid of Blue Screen on Mac
- Shutdown the Mac and Disconnect Peripherals.
- Restart Mac in Safe Mode.
- Check Login items on your Mac.
- Repair Your Disk Using Recovery Mode.
- Reinstall macOS.
What to do when your MacBook is stuck on a white screen?
If you experience some issues related to these settings, resetting PRAM might fix your MacBook stuck on white screen. Here’s how to reset PRAM/NVRAM: Shut down your Mac. Immediately press these four keys together: Command+Option+P+R. Hold down the keys until you hear the startup sound.
What to do when your Mac wont turn on?
Starting your Mac in safe mode is the first thing you should do when your Mac won’t turn on. To start up in safe mode: Press the power button, then immediately press and hold the Shift key. When you see the Apple logo, release the Shift key.
Why is my MacBook Pro taking so long to boot?
Immediately after you hear the startup sound, press and hold the Shift key. Release the Shift key when you see the Apple logo appear on the screen. After the Apple logo appears, it might take longer than usual to reach the login screen or your desktop. This is because your Mac performs a directory check of your startup disk as part of safe mode.
What to do when your MacBook is stuck in safe mode?
To start up in safe mode: Press the power button, then immediately press and hold the Shift key. When you see the Apple logo, release the Shift key. Once you boot using safe mode, the very first thing is deleting cache files.