OS X 10.4.3 running on iMAC G5 sometimes does not switch off

My i Mac G5 has been working nicely and smoothly and still does.. but recently it seems it does not won't to switch off....so I am forced to force it out.
At times a window appear saying more or less " the mirror agent is unable to log out due to elapsed time "
Any clues ? thanks - Massimo
Imac G5-1.6 ghz   Mac OS X (10.4.3)  
Imac G5-1.6 ghz   Mac OS X (10.4.3)  
Imac G5-1.6 ghz   Mac OS X (10.4.3)  

Welcome to Apple Discussions!
Force shutting down like that isn't wise. Eventually the directory may get damaged. If you had a force shut down for another reason that may have started the loop of having trouble. Backup your data, and follow these instructions for repair of the directory:
http://docs.info.apple.com/article.html?artnum=106214
If they don't work, you will want to get Alsoft Disk Warrior.

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