My mac pro book is blocked /jammed, the OS start stays on the apple without end

Two days ago, I have stopped my mac book pro after 2 hours of synchro with a time capsule  (clean session).
From this event, my mac is not start properly. It satsy in the system launch "white apple on the grey back" with the barrels wheel running
I'd like re boot my mac. But How do it?
I ve tried "cmd+s" at the start and 've seen message saying that ok and suugest to "exit" if i don't want to modify the file
Hwo to valid "exit"???
Thank you for your help!

First try to do a Safe Boot and see if it manages to start up. Hold down the Shift key prior to the startup chime, wait (a long time) till it starts. This will load JUST the OS, no non-Apple stuff. If it manages to get going, try to restart and see if the problem is solved. Safe Boot also clears all the system and user caches (why it takes so long) so if one is corrupted and impeding start, this may clear it out. Holler back with results.

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