Pass the option to format disk and follow the onscreen guide to complete the installation.In the macOS utilities interface, choose Reinstall macOS.Once you hear the sound, press and hold Command+R.Sometimes, a problem just appears during the 1 st installation of a new macOS version and reinstalling can magically solve the problem. Then check the Startup Disk, Display, Date & Time and reset as needed.Then release the keys to allow your mac to continue starting. Press Power button, then press and hold Option+Command+P+R for 20 seconds. So, we can reset NVRAM if your mac doesn’t turn one. If there is something wrong goes on the values of NRRAM, your mac won’t start up, and this happens when you upgrade your mac to a new macOS version. NVRAM means non-volatile random access memory, it refers to a small amount of special memory in each mac to store the information that your mac needed before it loaded the operating system.
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