the "prohibitory sign" appears when a major component of MacOS is found to be missing or damaged while starting up. You will need to re-Install MacOS.
I just installed an update on my 2013 MacBook Pro. When I restarted and entered in my password, the computer just gave me a white screen with a symbol: a circle with a line through it (error). Any ideas? Thx for your help!
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the "prohibitory sign" appears when a major component of MacOS is found to be missing or damaged while starting up. You will need to re-Install MacOS.
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Thank you , Grant! I will give that a try. I really appreciate your help.
what version were you starting with, and what version were you upgrading to?
2013 macbook pro gets error message restarting after update