I'm starting school in the fall and I'm going into advertising so I figured the best computer for my field would be a mac. I've owned pcs my entire life so I'm really at a loss for where to start when I get my new iMac. I ordered a 20" white iMac with 250GB HD 2GB ram and the rest. I see that a lot of people purchase more ram from third party sites like crucial And newegg. For some reason I was under the impression tat opening it up would void the warranty, is that not the case here? Also any starter tips for when I first take it out of the box would be greatly appreciated! Thanks on advance!