Drives not working following 10.4.6 upgrade

I have just upgraded to OX 10.4.6 (from 10.2.1), and now my Mac will not recognise any devices connected to the USB, Firewire or internal CD/DVD drives. For example, the CD/DVD eject key works, but if I put in a disk (blank or pre-recorded), absolutely nothing happens. Likewise with the USB & FireWire ports: my iPod, USB flash drive, Lacie back-up drive & external modem are all ignored (but work fine on my IBM ThinkPad). The only thing that does work is a USB mouse.
Anything plugged into the USB & Firewire ports does show up in System Profiler. I have run the Disk Utility/Repair and no problems were detected. Also tried re-setting the ports by taking the battery out for at least an hour, but with no success. The Tiger upgrade installation seemed to go ok (I did an Archive & Install), but the Mac has been a bit unstable ever since: it has crashed 5 or 6 times & has other minor niggles, like the power/battery monitor not working. It is a G3 iBook with 640 MB RAM.
Would anyone have any ideas on how I can fix this? Many thanks.

Hi Chris, you are troubleshooting correctly, one more thing you might try.
Resetting PRAM and NVRAM
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
Hope this works for you,
Ray

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