IBook hangs when running from Firewire drive

My iBook's internal drive took a dive recently. Luckily I was able to salvage the data and attached a bootable firewire drive.
It works fine but the system hangs intermittently for no reason. I unmounted the damaged internal drive and it is not showing under mounted drives so I am thinking that is not the problem.
My next thing as order of business would be to open up the laptop and replace the hard drive but I am wondering if this actually isn't a sign of worse problems like fw controller failing intermittently or something else?
Thanks for your help in advance.
G4 iBook 758ram 1.2 gHz processor   Mac OS X (10.4.8)  

I have no clue why it is still running. Basically the screen freezes and I get to move the mouse to no avail, I get the swirly circle moving like it is thinking, stays like that forever. I unplug the FW cable and plug it back up - the swirly disappears, I can close out of programs for a few clicks, then the swirly comes back up and stays there...unplug again and shutdown. Then I restart and I log back up into OS X. My internal drive is not showing up under "Startup Disk" as it got corrupted beyound repair. I wonder if it could be the hardware controller in the firewire adapter which is Maddog and not the best brand out there?
What it boils down is that this machine needs to be disassembled and hd to be replaced, I was hoping to stave off the inevitable by a few months...

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