Can't reboot rMBP because app is stuck open

i'm new using macs, got first personal 1 in nov, can't find way fix issue googling.

when plugged iphone in, iphoto auto opened , crashed ... , did unity. took while error messages/ close app thingies appear , apps close.

however, unity still showing in force quit list, no else. used this see other ways of force quitting, , unity shows in force quit list. selecting , clicking force quit nothing. i'm unable shut down or reboot, message "your mac hasn't restarted because "unity" failed quit. continue restarting, quit "unity"." cancel/ try again.

same error message displayed if try shutdown via power button.

i'm running retina macbook pro on yosamite.



[edit: 2 mins after posting this, rebooted :e
i'd still interested in replies though, in case happens again, thanks.]

 

if unable application quit using force quit, can try using activity monitor see if there other hung processes causing system, or application hang.

once open activity monitor, click view -> processes. if unable force quit form here, may have force reboot pushing , holding power button. ensure work saved (within running applications) before this.

 

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