Hi. I'm new to this forum. I have used Macs before, but never owned one... I'm thinking of purchasing a pre-owned PowerMac G4 from PowerMax (saw one online that I liked). I'm doing some research as to the upgradeability of this particular model, and, so far, I think I can upgrade the RAM (using PC100 modules) and the hard drive (I plan to put in a Seagate 160Gb hard drive that I'm currently using in a PC). My question is: what does it take to upgrade the optical drive (the model that I saw comes with a DVD-Rom drive)? I'd like to put in my HP DVD Writer if possible, but I'm not too familiar with the hardware aspect of the Macintosh. I'm sure that the hard drive uses an ATA interface, but what about the optical drives? Do they also use the ATA interface, or do they use SCSI? I guess if I have to, I can purchase an external drive, but I'd rather have an internal one, if at all possible. In addition, does this particular Mac come with USB 2.0 ports, or would I have to purchase a card to give it that functionality? So far, I have already purchased Mac OS X 10.2 and QuarkXPress 6. I'm planning to use it for typesetting and graphics manipulation, but I don't want to shell out the $$ for a brand-new Mac. Any help would be very much appreciated.