No matter what the picture says about just sticking the RAM into the slot at a 30 degree angle, then putting in place, it’s wrong. You have to shove it in at the 30 degree angle until it clicks, then push down. When you’re done, you shouldn’t be able to see the copper pins anymore.
The documentation is kind of confusing, but a 1GHz iBook will take both PC2100 and PC2700 speed RAM.
It took me my roommate showing me how to do this before I got my iBook to recognize the GB of RAM I bought for it. I think it’s fair to repeat his question, “you got a degree in electrical engineering for what?”
