1Ghz TiBook - Random freezing. Logic board fault?

Hi all,
perhaps one of you might be able to help troubleshoot this, because it's seriously driving me up the wall! I bought a used 1Ghz Titanium (DVI) recently and I'm finding that it freezes randomly when in use, requiring a comand+control restart. I've almost always experienced it in Safari, but also once in Entourage, illustrator and also in MacOS 9.2.2 Finder. Essentially what happens is that the cursor freezes and the powerbook no longer responds to keystrokes or trackpad input. I've tried an external mouse but that doesn't fix things either. The display is still lit but any moving graphics/video are frozen on screen. If music is playing in iTunes it cuts out leaving the last second of sound looping. Shortly after freezing I sometimes hear the fan come on, so perhaps there is a part of the powerbook still working after the crash (?). Also, I can select/deselect the caps lock and number lock keys and the green LEDs switch on and off, so perhaps it's not completely dead? The moment of the freeze almost always coincides with a mouse/trackpad click on the scroll bar, menu, safari menu bar, dock icon, form submit button, etc. It will on occasion freeze overnight when there is no mousing at all. generally though I can leave it playing iTunes all night and when I start using it in the morning it'll freeze when I collect my email or something.
the frequency of the freezing is semi-random; I have gone for roughly 48hrs of constant use without incident and then suddenly 2-4 crashes in short succession (ie, within about 10 mins of each other). Generally it freezes about 2 or 3 times a day. They do often come regular clumps.
Initially I thought it was Safari, or the OSX 10.4.5 installation that came with the powerbook, but I removed the entire HD and replaced it with the working drive from my Pismo and had exactly the same symptoms. Realising it was hardware related I did the usual drill of swapping, re-seating and removing ram, etc - but no dice. I've run Apple Hardware Test in a couple of 18hr loops but they return a glowing report about my hardware! techtool does likewise. I took it to the new Apple Centre in London where they ran their (apparently more powerful) AHT CD for 73 loops over 3 hours. Again, no reported errors!
I've read the long 'trackpad cable thread', and opened my powerbook to see if pinching the cable is an issue, but it's clearly not. I have lots of clearance around my trackpad cable and it's not in contact with any part of the case. I've even applied pressure all around the palmrest and the outside of my powerbook case hoping to induce a freeze but that doesn't seem to do anything.
What should I do next? when the powerbook works it's fine, but I'm at a loss as to what's causing the freezing. As a performing musician playing to hundreds of people a fault like this renders my powerbook useless since it must be absolutely stable and bullet-proof on stage.
thanks for reading and I'm grateful for any advice.
TiBook 1Ghz (DVI)   Mac OS X (10.3.9)   9600/350

hi there,
thanks for the welcome. i've been visiting here for a while and find all the posts very useful.
the trackpad issue is an odd one; my powerbook doesn't seem to show the classic symptoms of weird startup chimes or jerky cursor movement, etc in the other thread. I nonetheless opened up the powerbook praying that I'd find a pinched cable since that would have been so easy to fix. unfortunately there's nothing about it that looks problematic.
I had also suspected heat as being an issue and searched this forum a couple of times for related posts, but couldn't find anything. When I opened the powerbook i checked the fans for obstructions and blew out any dust i could see (i didn't have compressed gas). Again, they looked fairly normal to me - i didn't spot anything obvious like a trapped cable. As far as I can tell all 3 fans come on OK. First one of them and then after some time another one or two turn on after the powerbook has been running a while. (Is it actually possible to determine whether or not they're all working?)
It's difficult to say whether heat is actually related to the freezing. certainly I often notice the fans come on before a freeze, or right afterwards, but just as many times that's not the case. what is consistant however is that the freeze occurs the instance a cursor selection is clicked.
would you say this would be resolved by a logic board swap, because I know someone selling one. On the other hand, I'm a little confused by all the error-free reports I get when I run the Apple Hardware Test for extened loops.
thanks again for your help!

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