http://xlr8yourmac.com/systems/PB_G4_15_AL_takeapart/AL_PB_G4_take-apart.html

FYI: This article was posted in 2003 - Our FAQ’s PowerBook section (and iBook section) links to later/more detailed guides (including PDF downloads) available at iFixit’s Take-Apart Guides page.

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Note: Disassembly of your Powerbook to this level will void the warranty should any damage happen in the process. Use the info here at your own risk. Consult your owner’s manual for ESD and other precautions.

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Here are a set of internal photos of the Aluminum PowerBook 15″. Getting one open isn’t too difficult, however I don’t recommend anyone try it who might be worried about voiding their warrantee. Finding a Philips screwdriver with the right tip is probably the most difficult part. I had a Curtis pocket tweeker that did the job well. You also need a very small Allen wrench for the two screws at the top-rear of the keyboard. I’d guess it is a 1.5mm Allen, but that is just a guess. Arrows in the photos point out all the screw locations.

I used this great article to assist me in upgrading the hard drive in my Powerbook G4. The drive had been getting noisy and I could sense it was time to replace it. I turned up at a few shops and got told it was £50 to have it swapped (I was concerned I might break something or get bored with a half working Powerbook), anyway it’s done now, it was a bit fiddly and I had to buy an allen key thing to unlock the top part of the laptop but once that was done it was not too bad.

Plugged in the new disk, switched on the notebook holding down c with the mac os cd and reinstalled. It’s something I confess that you want to do taking your time and make sure you remember which screws go in which part of the notebook. The site also has instructions for other apple laptops, or check out iFxit’s guide as above, it’s really good.