High Sierra Installation stopped on PRO

My Macbook PRO stopped under installation of High Sierra, saying cannot install on this computer. Now showing a blinking folder with a question mark. Cannot start anymore. How do I repair?

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The way MacOS Install generally proceeds is this:

 

a chunk of new software (actually a minimal system of the Incoming software) is ADDED to your boot drive. This does not replace you current system.

The start Disk is set to the newly copied minimal system

A restart occurs, booting to the new System.

If the Install gets in trouble at this point, your old system is still intact, it just needs to be re-specifed.

 

All you need to do is get the startup disk set back to the old system.

 

You can boot to recovery (Command-R), then quit recovery, and Startup Disk will be activated as you quit, and you can re-specify your Startup Disk.

 

You can Alt/Option Boot and select your regular Startup disk and tell it to proceed, Once Mac OS is active, be sure to use:

System preferences > Startup Disk ...

 

... to set the startup disk normally again.

 

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if you would like help on making the Install work, please post the exact model MacBook Pro, including year and screen size, or the MacBook Pro 17,2 designation.

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