Hey, native00, thanks for the quick reply!
So the problem was in the KingMax memory? I'm asking specifically about this brand because a local dealer offers KingMax SO-DIMMs for a great price, and I'm wondering if I should give it a shot. The problem is, KingMax is all they offer - I can't exchange for another brand SO-DIMM if it doesn't work (and it's one of those 'guerilla' style computer stores - if I want to return something, I have to pay restocking fee, etc....).
KingMax apparantly SHOULD work in Powerbooks, according to the link I posted before, but that could just be marketing fluff.
Do you remember if your stick of KingMax was a "TinyBGA" configuration? Follow the link and look at the image - KingMax uses their own method of organizing the memory chips on the memory board. Supposedly, it offers better speed, lower power consumption, and better cooling. It seems like "TinyBGA" SO-DIMMS are all that KingMax offers now, and the price is definitely right ($142 CDN for a 512MB stick).
Please let me know - thanks so much for the help!