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Mac Mini won't start normally.

This is a continuation and refinement of a previous question.

On a plain power on, my Mac Mini displays the apple symbol and never anything else.

On a power on while holding down the Option and R keys, it displays the apple and a progress bar.  When the progress bar completes, I get the log on dialog and can log on. It behaves completely normally through every process I've tried, even for days.  But if I log off (or restart) (I don't remember at the moment if the effects on logon of logoff and restart are the same) the only way to get it open again is with Option and R at power on.

Does this suggest to anyone what the specific cause might be?
Ronald Hicks
Ronald Hicks
1 Solution
Ronald HicksAuthor Commented:
Well, that was in accurate, but maybe not in the essential point.

When I start with AppleKey  and R pressed,  I get a menu with 4 choices, for repair or reinstall etc
After I close (and I did a reinstall (of Sierra) ) if I just restart, I get only the Apple symbol in mid-scree,.  

If I restart with the AppleKey pressed (but not R also), I get a progress bar, then a logon box when it finishes after a minute or so..

Whats going on with the progress bar? Am I in  safe mode, having started that way?  Everything seems to behave normally.

--ron hicks
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