Hi everyone, I have a 20" iMac g5 with the 2 gHz Intel Core Duo. I do not have tons of experience working on computers so I need some help. I believe my hard drive is going out on me, everytime I get on my comp the hard drive begins this clicking sound and then i get a white screen with a blinking folder that has a ? on it. So if my hard drive is done, what one should I go with? I would like to upgrade to a faster and larger one. Any help is appreciated!