Mac software not installing
So my grandfather gave me in his Mac and I need to factory reset it so I erase the hard drive and go to reinstall macOS and it says the server cannot be found
iMac Line (2012 and Later)
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What to do before you sell, give away, or trade in your Mac
Factory reset of your Mac - Apple Support
Internet/Network Recovery of El Capitan or Later on a Clean Disk
This will erase the drive and install the original factory macOS.
- Restart the computer. Immediately, at or before the chime, hold down the (Command-Option-Shift-R) keys until a globe appears.
- The Utility Menu will appear in from 5-20 minutes. Be patient.
- Select Disk Utility and click on the Continue button.
- When Disk Utility loads select the target drive (out-dented entry w/type and size) from the side list.
- Click on the Erase button in Disk Utility's toolbar. A panel will drop down.
- Set the partition scheme to GUID.
- Set the Format type to APFS (SSDs, only if installing Mojave or Catalina ) or Mac OS Extended, (Journaled.)
- Provide a volume name, usually "Macintosh HD."
- Click on the Apply button, then click on the Done button when it activates.
- Quit Disk Utility and return to the Utility Menu.
- Select Install OS X and click on the Continue button.
Upon completion, you can upgrade macOS. For 2012 models and later, you should see How to upgrade to macOS Catalina.