I had to open my PowerBook case to try to install the new MCE drive - if you read my other thread you know the problems I'm having with that. Long story short - now my lower memory slot doesn't work and I confirmed that it's the slot because the 3rd party and Apple RAM modules (1 GB and 512 MB) both work seperately on their own in the upper slot, and leaving just a module in the lower slot boots up my PowerBook to 4 beeps.
Anyway, I got the laptop from the Apple Store online last April, so it's within a year. Am I in luck?