Shut Down and/or Restart Hang... With a Twist

Leopard 10.5.2 intermittently hangs during Restart or Shutdown. I get an icon-less desktop and the little circle (not the beachball) that goes around and around.
I've Installed 10.5.1 and then did the combo 10.5.2 update on a Mac Pro (Tiger never installed).
The interesting thing: I do NOT have auto log in enabled, and sometimes when I shut down or restart from the log in screen (without ever even logging in at all) I'll get the hang, thereby forcing me to push the power button.
So, I am assuming that something is hanging on the OS and not letting it close. That something must be an app that loads BEFORE I log in. So, the only app I'm aware of that loads BEFORE I log in is Timbuktu (latest version 8.7). There may be others that load before I log in, but I don't know what they are IF there are any at all. All I know is that Timbuktu loads before I log in and therefore MAY be the source of the problem.
Anyone care to offer any thoughts? Thanks!

I also try to disconnect all my cable, but the problem persist.
I have a fishy: my Operative System is connect to a PCI Card for IDE HD and I can't put in stop all the operative systems (inside the PCI) because he can't stop the PCI Bus. In fact he don't came back from stop. I don't know if is it the problem also for this improper shutdown and restart.
The symptom is like James Reffner's symptom: I shutdown and all processes are close, apps, windows, Finder with desktop item, dock, menu bar and remain the desktop picture and this little circle in the center of the screen that goes around and around.
The funny thing is that If I shutdown the computer soon after the login, without open any application, he shutdown without problems.
Anyone know somethings that I can do?
Where I can find the problem?
In the console?
thanks... I hope!
Since I have the problem in two system: or my "Mac OS X install CD" is damage, or it is a hardware problem for my old G4 digital audio (incompatible), or is the PCI Card.
(I'm sorry for my imperfect English)

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