Great site.
Interesting quandary though...how do I go about figuring out which one I've got if I can't go to "about this mac" since the mac is not working?
Can you find a physical serial number on the Powerbook? Apple should be able to tell you from that which one you've got. Not sure where the serial # is though on a TI Powerbook, Paddy might know if you can't find it.
You also might be able to find a similar Powerbook cheap without a working drive on eBay?
HTH,
Chris K