Any computer experts here???

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I bought a new internal hard drive (actually I bought TWO) and I just CANNOT figure out WHERE exactly you're supposed to install it in the computer. I need step by step instructions and ANYTHING you can tell me would help TREMENDOUSLY. Start from the beginning, PLEASE....I have a Dell Optiplex GX1. This is a Christmas present I was planning to give to someone who's never had a computer and I'm DESPERATE for some help..