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by Carolyn Samit,May 25, 2016 12:35 PM in response to DeadeyeFletch
Carolyn Samit
May 25, 2016 12:35 PM
in response to DeadeyeFletch
Level 10 (120,143 points)
Apple WatchHi,
The prohibitory sign means your Mac can't find a system folder to boot from.
Startup your Mac while holding down the Option key. That should launch the Startup Manager window where you can select the startup disk (Macintosh HD) then click Restart.
If the startup disk is grayed out, the disk is failing or has failed and needs replacing.
You can make an appointment at a Genius Bar in advance.