This thread seems to be going nowhere. I perused the archive, I see no evidence 
of progress.

My advice:

1) Safe boot with Shift key at startup. Then reinstall the 10.4.11 PPC Combo 
Update.

2) Upon reboot hold (Cmd-v) keys for verbose dialog at startup. Hit Shutdown, 
and see what happens. It may be fixed, and shutdown normally. If not, you can 
see where the stall is.

3) If it's a USB card problem, look in System Profiler for the exact model of 
your card, you'll be looking for the VID (Vendor ID #) and DID (Device ID #), 
as well as the "Firmware revision". I've not encountered too many USB PCI cards 
needing firmware update, but I have encounter many external USB enclosures, 
including ones with NEC chipsets, that either didn't work on Mac, or worked 
very poorly, which were greatly improved by updating the firmware. Often 
finding such firmware is nearly impossible, most hardware this old has zero 
support, and websites shutdown, the Internet Archive>Wayback Machine is often 
the only hope. If you have the VID & DID and chipset, or model #, you might 
find others with PPC Macs with similar issues?

Often stalled shutdowns are network issues, perhaps you connected to another 
Mac or server in the past, and now it's waiting for some acknowledgement of a 
disconnect that's never coming. Hopefully a simple Safe Boot or reinstall of 
the Combo Update would solve this, but seeing the verbose dialog would surely 
be best.

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