My Mac won't shut down after upgrading to Panther

I recently upgraded to Panther 10.3 from Jaguar 10.2.9. After Panther had installed successfully, I used software update and I'm now running Panther 10.3.9. However, since then my Mac won't shut down. It doesn't hang or freeze - it just does nothing at all.
I've made sure no applications are running or have frozen. I've tried booting up from the OS X disk and running Disk Repair, and I've also tried using the 'fsck' tool. (I entered '/sbin/fsck -f' in single-user mode). Nothing has worked.
Now each time I want to shut down, I have to force shut down. Can anyone help?
800 MHz PowerPC G4 Mac OS X (10.3.9) 1.5 GB SDRAM

Hard shutdowns can cause disk damage. You are better off leaving your Mac on until the problem is sorted.
Have you disconnected all peripheral devices (unmount firewire drives before disconnecting) except Apple keyboard and mouse and tried shutdown? Often peripherals can kick back a signal to the cpu preventing shutdown.
-mj
[email protected]

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