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macOS Mojave: How to troubleshoot common problems
Figure out where the problem lies. If it's in downloading or installing macOS Mojave, then fair enough. If, however, you're only having trouble when using certain apps, then it's best to try and isolate the issue to just those apps. If it's a single app, try uninstalling and reinstalling or checking for updates.
What to do if Mojave doesn't seem to be downloading or installing
If you're trying to download macOS Mojave and it seems to just hang and not calculate or appear to be downloading or installing, first double check to make sure your internet connection is working and your Mac is connected to the internet. Then, try rebooting the Mac App Store.
What if macOS Mojave freezes or stops responding?
You can start by waiting. If you have time, leave your Mac for a while. It might work itself out after half an hour.
If you can't wait or waiting just doesn't work, you'll have to force a reboot. First, try by holding down the power button on your Mac and waiting until it shuts off and turns back on.
If your Mac won't even respond to the power button, then as a last resort, you can simply unplug it. Unplugging it should be the last thing you try, since you could end up bricking it altogether.
What to do if macOS Mojave won't restart
Boot in Recovery Mode
If your Mac boots up and just sits in a gray screen or you just get spinning wheel of death from the start, try booting in Recovery Mode. Here's how:
Wait for the repair to run. Your Mac will likely restart when it's finished.