I purchased this from the original owner in 2004 and he stated that it was a special order from Apple with maximum RAM and a 7,200 rpm 80GB HD. The original disk was 10.3.2. The HD had been wiped and original OS installed. It worked flawlessly. Several months later, I asked a friend who was an Apple support engineer if it would be worth upgrading to Tiger and he said emphatically, "yes!"
So we did one Saturday and it went perfectly including installing "Classic" for older applications like PageMaker that I still used quite a bit.
Mostly this computer was used when traveling and rarely at home. But every time that I called on it, she rose to the occasion.
During my most recent trip back in September of this year, I started having problems with applications working correctly and downloading replacement from a trusted source failed to self expand and install etc. Since I had brought along a firewire external drive I shifted the apps to it and they would expand and be usable there. So I began to suspect something was amiss with the PB's internal drive. Never the less, the PB was again usable.
Shortly, I hope to have in hand another external FW drive to see if I can install a system on it through the PB. (NOTE: The other external drive serves as my boot drive for my everyday Mac Mini late 2009 running Leopard.
In answer to your questions as to my system disks, yes the original 10.3.2 disk came with the PowerBook and yes, the retail version of 10.4.8 are the black with "X" on them which came in the original retail box.
I'm wary of disassembling almost anything as I am not a dexterous as I used to be. I think that it's the four screws in the back but the last time that was touched was by Apple prior to sale to the original owner.
Finally, the reason that I want to bring this machine back to life is that I recently acquired an old film scanner as I need to digitize a lot of my photographic files and this machine would be perfect in original configuration of 10.3.2 as that is the last compatible driver for the Dimage IV from Minolta.
So let's wait a few days to see if my proposed scheme will work.