You can reinstall macOS Sierra or macOS High Sierra by doing the following:
Press and hold down the C key immediately, and keep it pressed until your Mac either boots from the DVD or doesn’t. Reinstall mac os command r mac os x#
Insert the Mac OS X Install DVD into the DVD drive. 
To boot your Mac from a DVD-ROM installation disc, follow these steps: How do I do a clean install of macOS X from DVD?
Click the Restore pop-up menu, then choose the volume you want to copy. In the Disk Utility app on your Mac, select the volume that you want to restore in the sidebar, then click the Restore button. Restore a disk image with a single volume to a disk Reinstall your current version of macOS: Command-R. Reinstall your computer’s original version of macOS (including available updates): Option-Shift-Command-R. Install the latest version of macOS compatible with your computer: Option-Command-R. In the Recovery app window, select Reinstall for your macOS release, click Continue, then follow the onscreen instructions. Choose Apple menu > Shut Down, press and hold the power button until “Loading startup options” appears, select Options, click Continue, then follow the onscreen instructions. How can I reinstall OS X on a flash drive?. 
How do you reinstall Mac OS after Information Wipe?. How do I reinstall Mac OS from recovery partition?. How long does it take to reinstall OSX?. How do I reinstall OSX without Internet?. How do I do a clean install of macOS X from DVD?. How do I reinstall Mac from disk image?.
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