Mac users can keep their new or older machines humming with this fun and easy guide to the internal workings of Macs and iMacs. The book explains, step by step, how to upgrade a Mac -- processor, RAM, video, removable storage, and almost anything else. It also shows how to use a little preventive medicine and how to diagnose your problem in order to help you decide whether you need to repair or upgrade. Common repair scenarios, from hard disk glitches to peripheral problems, are covered. And the little gems that make this ...For Dummies edition shine are a list of utilities for getting to know your inner-iMac and special G3 and G4 fixes. With this trusty guide, you'll be thinking different" in no time.