Reinstall mac os x from disk

The installer will remain in your Applications folder. It will need to be at least 8GB in size. Give the USB stick a name then click Erase. Launch Terminal either by searching for it in Spotlight or navigating to the Utilities folder in Applications. You probably remember the only difference with clean installing High Sierra is changing the name of the app.

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Hit Return. Type in your admin password and wait. When the process is finished, the word Done will appear in the Terminal window. You can then quit Terminal. Enjoy Mojave, good-bye High Sierra.

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Restart your Mac and hold down Command-R to boot into recovery mode. Take your bootable USB and connect it to your Mac. Click Continue, then click Continue again when the next window appears. Click Install. Wait for macOS Mojave to install and your Mac to restart. Install macOS Mojave to your non-startup drive drive Find the Mojave installer in your Applications folder and launch it. Get Setapp.

Reinstall from macOS Recovery

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How to Reinstall macOS for a Fast and Squeaky Clean Mac

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Click on Disk Utility then Continue first of all to get your Mac's hard drive wiped. Select Erase and then confirm your choice. Follow the instructions that appear on screen, license agreements and all, and choose the hard drive to use in most cases it'll be the only one available. Along the way you can sign in with your Apple credentials to get your apps and iCloud links back again.

You're going to be looking at about an hour's worth of reinstalling time but after that you're good to go and ready to enjoy your good-as-new Mac OS X experience. Check whether you have RAM issues: If you have problems immediately after installing random-access memory RAM — or any new hardware, for that matter — double-check that the RAM chips are properly seated in their sockets. If you still have problems, remove the RAM chips temporarily and see whether the problem still exists.

Follow the installation instructions that came with the RAM chips — or the ones in the booklet that came with your Mac. Check out the brand new podcast series that makes learning easy with host Eric Martsolf.