I got a free Power Macintosh 7500 today. I am not totally sure what I am going to use it for other than maybe some old games. It's running some version of system 7. There are a few things that I would like to know how do I get the case open if I want to upgrade anything. Also the mouse that I got with it will move the cursor around the screen but when I try to click nothing happens, I'm assuming that the mouse is bad. does anybody here happen to have an Apple ADB mouse that I could get for cheap, or know where I could get one? I'll also take suggetions for a useful purpose for it.