Hello fellow nerds. I lost my silly Disk DVD. I have the ones for my iMac, however they don't work. I get the message (you cannot install os x on this computer). What I want.... this computer is about 2 years old. I want to reformat it to square one. Like brand new. I already backed everything up. When I called apple, I mentioned I just purchased Snow Leapord.. they said.. no biggy, just install that and it will replace everything back to square one. Well, that didn't work. I still have all my old programs. What should I do? Thanks!!