Mac does not switch off. Any idea how to fix this?

I already  repaired the rights on the disk....
Mac does not drive down, obviously after certain programs have been started. One of those programs is itunes. I have to use the power switch button for switching it off. Mac can be driven down normally immediately after start-up.....Any idea what to do?

Yes, this was exactly the sequence and again it worked...
Here is the result of the ps ax command:
Last login: Fri May 25 09:22:33 on console
mbp081:~ web$ ps ax
  PID   TT  STAT      TIME COMMAND
    1   ??  Ss     0:01.98 /sbin/launchd
    9   ??  Ss     0:07.96 /usr/libexec/kextd
   10   ??  Ss     0:03.20 /usr/sbin/DirectoryService
   11   ??  Ss     0:00.11 /usr/sbin/notifyd
   12   ??  Ss     0:00.11 /usr/sbin/syslogd
   13   ??  Ss     0:02.17 /usr/libexec/configd
   14   ??  Ss     0:00.08 /usr/sbin/distnoted
   15   ??  Ss     0:00.84 /usr/sbin/blued
   16   ??  Ss     0:00.10 /usr/sbin/diskarbitrationd
   19   ??  Ss     0:00.41 /usr/sbin/mDNSResponder -launchd
   22   ??  Ss     0:01.90 /System/Library/CoreServices/coreservicesd
   25   ??  Ss     0:00.20 /usr/sbin/securityd -i
   32   ??  Ss     0:00.07 /usr/sbin/ntpd -c /private/etc/ntp-restrict.conf -n -g -p /var/run/ntpd.pid -f /var/db/ntp.drift
   33   ??  Ss     0:00.12 /usr/sbin/cupsd -l
   34   ??  Ss     0:00.37 /usr/sbin/krb5kdc -n
   35   ??  Ss     0:00.01 /usr/sbin/cron
   38   ??  Ss     0:00.08 /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/A/Resources/u sbmuxd -launchd
   39   ??  Ss     0:00.02 /sbin/SystemStarter
   43   ??  Ss     0:00.06 /System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Su pport/RFBRegisterMDNS
   45   ??  Ss     0:00.38 /System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.framework /Support/mds
   46   ??  Ss     0:00.61 /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow console
   47   ??  Ss     0:00.01 /usr/sbin/KernelEventAgent
   49   ??  Ss     0:00.64 /usr/libexec/hidd
   50   ??  Ss     0:00.06 /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/CarbonC ore.framework/Versions/A/Support/fseventsd
   52   ??  Ss     0:00.01 /sbin/dynamic_pager -F /private/var/vm/swapfile
   58   ??  Ss     0:00.01 autofsd
   66   ??  Ss     0:02.25 /usr/libexec/ApplicationFirewall/socketfilterfw
   81   ??  Ss     0:00.03 /usr/sbin/ocspd
   88   ??  S      0:00.21 /Applications/Retrospect Client.app/Contents/Resources/retroclient
   89   ??  Ss     0:00.01 /Library/StartupItems/ParallelsTransporter/llipd
   93   ??  Ss     0:04.04 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreGraphic s.framework/Resources/WindowServer -daemon
   94   ??  Ss     0:00.11 /usr/sbin/nmbd -F
  114   ??  Ss     0:00.05 /usr/sbin/coreaudiod
  136   ??  Ss     0:02.00 /sbin/launchd
  140   ??  S      0:02.16 /System/Library/CoreServices/Dock.app/Contents/MacOS/Dock
  141   ??  S      0:01.01 /System/Library/CoreServices/SystemUIServer.app/Contents/MacOS/SystemUIServer
  142   ??  S      0:03.13 /System/Library/CoreServices/Finder.app/Contents/MacOS/Finder
  146   ??  S      0:00.01 /usr/sbin/pboard
  147   ??  S      0:00.44 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framewo rk/Support/fontd
  150   ??  S      0:00.62 /usr/libexec/UserEventAgent -l Aqua
  153   ??  S      0:00.07 /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAg ent
  158   ??  S      0:00.13 /System/Library/CoreServices/AirPort Base Station Agent.app/Contents/MacOS/AirPort Base Station Agent -launchd -allowquit
  159   ??  S      0:00.03 /System/Library/CoreServices/CCacheServer.app/Contents/MacOS/CCacheServer
  160   ??  S      0:00.07 /System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Ma cOS/AppleVNCServer
  171   ??  S      0:00.24 /System/Library/Frameworks/SyncServices.framework/Versions/Current/Resources/Sy ncServer.app/Contents/MacOS/SyncServer
  178   ??  Ss     0:00.14 /usr/sbin/smbd -F
  183   ??  S      0:05.65 /Applications/iTunes.app/Contents/MacOS/iTunes -psn_0_65552
  186   ??  S      0:00.07 /Applications/iTunes.app/Contents/MacOS/iTunesHelper.app/Contents/MacOS/iTunesH elper -psn_0_69649
  188   ??  Ss     0:01.01 /System/Library/PrivateFrameworks/ApplePushService.framework/applepushserviced
  192   ??  S      0:01.09 /Applications/Utilities/Terminal.app/Contents/MacOS/Terminal -psn_0_73746
  195 s000  Ss     0:00.07 login -pf web
  196 s000  S      0:00.02 -bash
  204 s000  R+     0:00.01 ps ax
mbp081:~ web$

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