Your Mac restarts after installation is complete.
#Install r mac os x serial number
To verify eligibility to install macOS, your Mac serial number is sent to Apple, and you might be asked for your Apple ID. If you don't see it, click Show All Disks.
![install r mac os x install r mac os x](https://cdn.osxdaily.com/wp-content/uploads/2017/10/clean-install-macos-high-sierra.jpg)
Upgrade to the latest macOS that is compatible with your Mac. Install the latest macOS that was installed on your Mac, without upgrading to a later version. Release when you see the Apple logo or a spinning globe.
![install r mac os x install r mac os x](http://3.bp.blogspot.com/_R4kHvzHdMTk/StwHEyK1FgI/AAAAAAAAKLU/YMN_G2ioOME/w1200-h630-p-k-no-nu/Mac+OS+X+10.6+Snow+Leopard+[+Untouched+Full+Retail+DVD+].jpg)
Hold down one of the following combinations immediately after pressing the power button to turn on your Mac. The Recovery installs different versions of macOS depending on the key combination you press while starting up.