The OS install will probably restart the Mac once or twice, the screen may go dark for a little while, and you will see "the progress bar" one or more times.ħ. Now quit disk utility and open the OS installer. Once you choose this, now click the erase button. if you're going to install High Sierra or something older, choose "Mac OS extended with journaling enabled", GUID partition formatĥ. if you're going to install Mojave or Catalina (I would not install Catalina unless there is no other choice), choose to erase in APFS, with GUID partition format This represents the actual physical drive inside. In disk utility's window, look to the left. If it's NOT there, don't worry about this and go to step 3.ģ. Is there a "view" menu? If so, choose "Show all devices" if it's there. When you get to internet recovery, try this:Ģ. It would help to know what year the iMac was made and what version of the OS had been previously running on it.
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