Prohibitory symbol

thumb|232px|right|
The prohibitory symbol is a sign of trouble on a Mac running Mac OS X or macOS. It is similar to a Sad Mac icon and the Chimes of Death in classic Mac OS, which signifies that the Mac is unable to boot normally.
==Description==
===Mac OS X===
In past versions of Mac OS X, the prohibitory sign appeared as a large gray circle with a diagonal line across the middle of it, on a lighter gray screen. Normal booting would display a gray Apple logo with a spinning animation of progress beneath it.
===macOS===
In recent versions of macOS, the prohibitory symbol appears as a light gray symbol on a black screen. Normal booting would display a white Apple logo with a progress bar underneath.
==See also==
*Kernel panic
==External links==
*If your Mac doesn't start up all the way at Apple Support (2022-05-17)
**If your Mac starts up to a circle with a line through it (2022-06-23)
*iMac shows prohibitory symbol at Ask Different
*Resolve boot issues showing 'prohibitory' sign by Topher Kessler at CNET (2010-01-29)
**Managing a prohibitory sign at OS X bootup by Topher Kessler (2011-07-14)
* at Wikipedia
Category:Mac OS X
Category:macOS
Category:Troubleshooting