Cannot shut down the computer !

I cannot shut down my computer after I click Apple menu>shut down>>shut down again. Then got no response for a while, prompt out "Logout has timed out because the application Finder failed to quit. To try again, quit Finder and choose Log Out from Apple menu." But I have already close Finder by clicking the RED button on top left corner. From the Finder pull down menu, I cannot find the "Quit" command. When I click Apple Menu again and click Force Quit, it prompt out a small window and ask to Re-launch Finder, or Cancel. If I click cancel, nothing happen, if I click re-launch, it flash and keep asking Re-launch. What's happened to my computer? Anyone can help ?

This is a problem that I've been having with the two IMacs our office uses. It doesn't happen every time, which makes it even more difficult to troubleshoot.
What happens is the computer goes into shutdown(or logging out) mode, hangs for awhile, then the desktop just comes back on. Often there will be an error message saying something like "Logout timed out due to failure of Safari to quit." And sometimes it will list a different application. But, in all instances, there ARE no applications open. When I launch the Activity Monitor, it confirms that there are no hidden apps running anywhere. It just won't shut down or log out. At that point, you have to force power down with the power button, which is not a healthy way to shut down on a regular basis.
I've run disk utility and permissions repair off the system disk. I've zapped the PRAM. My latest attempt has been to reset the SMC, so I will have to monitor it to see if it did the trick.
I'm sure that if I called Applecare at this point that they would tell me to archive and install. But that is a bit drastic a step and isn't really troubleshooting. Not when it will take considerable time to reconfigure these machines for uncertain results. Since A.) the IMacs were right out of the box when this problem began and B.) the MacPros and MacBooks that run the same OS and the same software DO NOT experience a similar problem, I suspect it wouldn't resolve the issue.
I just want to exhaust all other possibilities before taking the archive and install step, because you always end up losing prefs from third party software, etc...
Has anyone else experienced this problem before???

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