Hey guys.. I'm having a problem with my iMac. I've seen a few topics on a number of different forums, but the problem isn't specific enough to my situation to be sure. I'm not extremely computer saavy, so forgive me. I heat-warped my old HD on my iMac, so I bought a new HD online and brought it to my local Apple dealer to have it installed. (there are zero Apple stores within 50 miles or so) I lost my original gray DVD that came with my computer, (I know this is a huge no-no, but I moved twice since I bought the computer, and I've looked everywhere to no avail) so I called Apple and had replacement 10.4 DVDs sent to me. When I boot up, I get the popular error message of, "this software cannot be installed on this computer". When I picked up the machine, the guys at the Apple dealer said that was all formatted and ready for a new OS. Before this new install on the brand new HD, I did use the install discs once before to reformat on the old HD. Is there no alternative to calling Apple and having more replacement DVDs sent? Is it possible they sent me the wrong ones?