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If you get a boot chime, keep holding the same 4 keys until you hear two more chimes. Restart with an NVRAM reset (immediately hold Option-Command-p & r). Here comes the second part of my two-step dance: Quit Disk Utility, then Shut Down your Mac. I prefer to format as Mac OS Extended (journaled), as the High Sierra installer will take care of converting to APFS. If you don't see most of that, make sure you have chosen to Show All Devices, and not Show Only Volumes. Choose the line with the device info (APPLE SSE SM0128G., etc) not the volume name, and not a container line. I often do a "two-step dance" when doing a clean install.īoot to your installer (or boot to internet recovery if you don't presently have a bootable installer), then open Disk Utility, and erase the drive.