I'm not sure about Powerbooks, but even in unibody Macbook Pros, both the HD and RAM are considered user-serviceable without voiding the warranty. There's an entire section of the manual dedicated to swapping them.
The hard drives in aluminum PowerBooks, older MacBook Pros, and virtually every other Apple laptop except the MacBooks and unibody MacBook Pros are not user-serviceable.
They aren't easy to get to: it takes a couple hours and ~50 screws to swap the drive in my 12" Powerbook — but it doesn't violate the warranty to do so.
They probably wouldn't have covered it if you obviously fucked it up while taking it apart, but there was never anti-tamper tape or anything in there to directly detect that you'd done so.
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I'm not sure about Powerbooks, but even in unibody Macbook Pros, both the HD and RAM are considered user-serviceable without voiding the warranty. There's an entire section of the manual dedicated to swapping them.
The hard drives in aluminum PowerBooks, older MacBook Pros, and virtually every other Apple laptop except the MacBooks and unibody MacBook Pros are not user-serviceable.
They aren't easy to get to: it takes a couple hours and ~50 screws to swap the drive in my 12" Powerbook — but it doesn't violate the warranty to do so.
They probably wouldn't have covered it if you obviously fucked it up while taking it apart, but there was never anti-tamper tape or anything in there to directly detect that you'd done so.