i had a mac once where it was clearly statd in the manual that if i so much as loosened any screw the warranty would be voided.
granted that was a macintosh Plus so things may have changed.
but i though this "not voiding the garranty" only applied to those machines (like most new macintoshes except the mini) that had instructions in the manual how to change the memory and had an easy way (like a hatch or something) to access the above mentioned.
I have a monkey, she's a doll.
Powerbook 12' 1.33 ghz / 512 mb ram / OS X.3.8
Saltek USB-pad / t610 / iPod 15gb / Airport Express.
Mac user since 1985.