IMac wont shut-down

Hi folks,
i`ve got an Intel iMac 24 inch 2.16 GHz Intel Core 2 Duo with Mac OS X 10.4.11 installed. Very often the iMac wont shut-down. When i choose the shut-down command from the Apple menu the Finder quits, the Icons on the desktop, the Dock and the Menu bar disappear. Then the screen turns blue and i see the grey spinning wheel but it wont go further. I always have to disconnect the power cord to shut-down my iMac. Here is what the system.log says:
Mar 18 18:28:49 macvier shutdown: halt by anita:
Mar 18 18:28:50 macvier SystemStarter[446]: authentication service (457) did not complete successfully
Mar 18 18:28:50 macvier Parallels: Stopping DHCP/NAT daemon...
Mar 18 18:28:51 macvier Parallels: Unloading Network module...
Mar 18 18:28:52 macvier Parallels: Unloading ConnectUSB module...
Mar 18 18:28:52 macvier Parallels: Unloading Monitor module...
Mar 18 18:28:54 macvier kernel[0]: [Parallels] Parallels VM observer thread stopped
Mar 18 18:28:54 macvier Parallels: Unloading Hypervisor module...
Mar 18 18:28:54 macvier kernel[0]: [Parallels] Parallels Hypervisor exited.
Mar 18 18:28:54 macvier Parallels: Shutdown complete.
Mar 18 18:28:54 macvier SystemStarter[446]: The following StartupItems failed to properly start:
Mar 18 18:28:54 macvier SystemStarter[446]: /System/Library/StartupItems/AuthServer
Mar 18 18:28:54 macvier SystemStarter[446]: - execution of Startup script failed
Can anyone help me? I dont know how to get rid of this problem.
Greets
TF
Message was edited by: Computerdoc
Message was edited by: Computerdoc

Perhaps this is an app booting on launch that's not helping matters. Here are some ways of preventing items from opening automatically ...
If the login window appears when you start up your computer, hold down the Shift key and click the Login button. Continue to hold down the Shift key until you see the Dock.
If you don’t see the login window when you start up your computer, hold down the Shift key when you see the progress bar in the startup window. Continue holding down the key until your desktop appears and the startup completely finishes.
Choose Apple menu > System Preferences, and then click Accounts. Select an administrator’s account, and the click Login Items. If any unwanted items appear in the list of items that open automatically, select the item and click the Delete - button.
You could try resetting the SMC. http://support.apple.com/kb/HT1543
Carolyn

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