This is my 1st post on Mac Rumors (hope to be around for a while) I have come back to mac, though It's been a while since i have owned one (LCII), since then I have owend a couple sony vaio notebooks, which were ok, but i got real tired of the problems and windows. Anyway I now own a 15" PB 1.33 with 256mb, etc. and my questions are; is it normal for the hard drive when the room is completly silent to make a slight buzzing/whirling sound followed by a slight click or rattle every 5-10sec ? And is it normal when scrolling up and down in a window for it to sometimes pause for a split second? - would a ram upgrade fix that? Sorry for the dumb questions, I just want to keep my PB in perfect running condition since i plan on using it for a while.