The Mac will then display all the startup disks available. Just connect the USB disk and press the Option/Alt Key when you hear the boot sound. As said earlier, you could use the macOS USB installer to do a clean install or restore it upon a boot failure.
#HOW TO CLEAN INSTALL MAC OS X OFFLINE#
Simply click "Restart", Enjoy the Welcome Video, Select your country or region, Select your keyboard layout, Migration Assistant will now open so if you want to migrate your data from the backup you made earlier, select "From a Time Machine backup" (or "From another volume on this Mac" if you did not use Time Machine), there you go It will then reboot and voilà, you are done!. Clean installing or restoring a Mac offline with USB pen drive. The installation process will take about 30-60 minutes depending on your computer, When the installation has succeeded, it will ask you to restart the computer.
Select the erased hard drive/partition you just created and click "Install". It will now ask you where do you want to install it. A clean install replaces the System Folder, which contains all the vital parts of the Mac OS, instead of updating or modifying it.Typically, the old System Folder is renamed Previous System Folder.
#HOW TO CLEAN INSTALL MAC OS X MAC OS X#
Click "Continue" and an agreement will appear, click "Agree". Note: Although Mac OS X 10.2 and later has a similar feature called Archive and Install, this document applies only to Mac OS 9.x and earlier. Select your hard drive or partition from the left-hand-side menu (note: if you have installed Windows on to your Mac and wish to keep it as it is, choose your Mac OS X partition because if you erase the whole hard drive, your Windows partition will be erased as well). Select Utilities from the Menu Bar (the grey bar on the top) and open Disk Utility. You should now be at the "Install Mac OS X" screen. It will now prepare the installation and this may again take up to several minutes so be patient. Select your language and click the arrow (->). It may take up to several minutes to load everything, so please, be patient. Make a backup with Time Machine (or Carbon Copy Cloner or SuperDuper!), Boot from the install disc by holding alt key (?) and select the install disc with arrow keys and hit enter.
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