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I accidentally unmounted and erased the Macintosh HD in disk utility and restored to the OS X Base System, and now I can't reinstall macOS. The only disk that shows up in disk utility is the OS X Base System. Please Help!!!

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    It would be helpful to know what specific Mac you have. Also if you hold down Command-R it should get you into Internet Recovery Mode which will allow you to reinstall macOS, if your Mac is new enough. – Steve Chambers Apr 22 '18 at 21:43
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use Command+R For Internet Recovery To the version you were using and Command + Shift + R for internet recovery (to The latest version). When you will go to internet recovery a disk utility option will be there and u can configure , format your hdd there and install new os

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  • This is assuming the iMac is "new enough". Very old iMacs need to boot on installation media. – Thorbjørn Ravn Andersen Apr 23 '18 at 11:12

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