OK, merci, je vais regarder de ce côté-là puis je fais un retour sur ce qui apparaît.
Voici ce que ça dit, mais c'est illisible pour moi. Si cela vous inspire quelque chose :
08/11/2016 22:39:19,534 WindowServer[170] CGXGetConnectionProperty: Invalid connection 46651
08/11/2016 22:39:19,535 WindowServer[170] CGXGetConnectionProperty: Invalid connection 46651
08/11/2016 22:39:19,535 WindowServer[170] CGXGetConnectionProperty: Invalid connection 46651
08/11/2016 22:39:19,535 WindowServer[170] CGXGetConnectionProperty: Invalid connection 46651
08/11/2016 22:39:19,535 WindowServer[170] CGXGetConnectionProperty: Invalid connection 46651
08/11/2016 22:39:19,541 loginwindow[91] Login Window point of no return
08/11/2016 22:39:19,549 com.apple.xpc.launchd[1] (com.apple.coreservices.uiagent[344]) Service exited due to signal: Killed: 9
08/11/2016 22:39:19,551 SystemUIServer[232] Spotlight: Service connection interrupted!
08/11/2016 22:39:19,555 com.apple.xpc.launchd[1] (com.apple.AirPlayUIAgent[273]) Service exited due to signal: Killed: 9
08/11/2016 22:39:19,558 AirPlayXPCHelper[96] 2016-11-08 10:39:19.557530 PM [APBrowser] IPv4 listener stopped.
08/11/2016 22:39:19,559 com.apple.xpc.launchd[1] (com.apple.lateragent[336]) Service exited due to signal: Killed: 9
08/11/2016 22:39:19,570 appleeventsd[48] SecTaskLoadEntitlements failed error=3
08/11/2016 22:39:19,570 appleeventsd[48] SecTaskLoadEntitlements failed error=3
08/11/2016 22:39:19,571 appleeventsd[48] SecTaskLoadEntitlements failed error=3
08/11/2016 22:39:19,571 appleeventsd[48] SecTaskLoadEntitlements failed error=3
08/11/2016 22:39:19,571 appleeventsd[48] SecTaskLoadEntitlements failed error=3
08/11/2016 22:39:19,571 appleeventsd[48] SecTaskLoadEntitlements failed error=3
08/11/2016 22:39:19,574 com.apple.xpc.launchd[1] (com.apple.wifi.WiFiAgent[278]) Service exited due to signal: Killed: 9
08/11/2016 22:39:19,575 com.apple.xpc.launchd[1] (com.apple.cloudphotosd[318]) Service exited due to signal: Killed: 9
08/11/2016 22:39:19,578 com.apple.xpc.launchd[1] (com.apple.FolderActionsDispatcher[257]) Service exited due to signal: Killed: 9
08/11/2016 22:39:19,635 sessionlogoutd[359] sessionlogoutd Launched
08/11/2016 22:39:19,642 sessionlogoutd[359] DEAD_PROCESS: 91 console
08/11/2016 22:39:19,645 sharingd[245] 22:39:19.645 : SCDynamicStoreCopyConsoleUser returned NULL
08/11/2016 22:39:19,646 sharingd[245] 22:39:19.645 : SDActivityAdvertiser::consoleUserChanged: Stopping for user 501 on logout
08/11/2016 22:39:19,646 sharingd[245] 22:39:19.645 : SCDynamicStoreCopyConsoleUser returned NULL
08/11/2016 22:39:19,646 sharingd[245] 22:39:19.645 : SCDynamicStoreCopyConsoleUser returned NULL
08/11/2016 22:39:19,646 sharingd[245] 22:39:19.646 : SCDynamicStoreCopyConsoleUser returned NULL
08/11/2016 22:39:19,678 shutdown[360] halt by marc:
08/11/2016 22:39:19,000 kernel[0] Kext loading now disabled.
08/11/2016 22:39:19,000 kernel[0] Kext unloading now disabled.
08/11/2016 22:39:19,000 kernel[0] Kext autounloading now disabled.
08/11/2016 22:39:19,000 kernel[0] Kernel requests now disabled.
08/11/2016 22:39:19,678 shutdown[360] SHUTDOWN_TIME: 1478641159 677641
08/11/2016 22:39:19,000 kernel[0] Process launchd [1] disabling system-wide I/O Throttling
08/11/2016 22:39:19,000 kernel[0] Process launchd [1] disabling system-wide CPU Throttling
08/11/2016 22:39:19,678 com.apple.xpc.launchd[1] (com.apple.xpc.launchd.domain.system) System shutdown initiated by: shutdown.360<-sessionlogoutd.359<-launchd.1