I have a late 2006 iMac 17" that I am trying to prepare for sale. So, I am trying to do an erase and install on it, using the original install discs. It was sold with the discs I am using, running tiger (which the discs have on them). But, when I boot from the cd, on the screen after the language selection it tells me "this software cannot be used with this computer." I have been trying every trick I could think of, including going into disk utility to try to erase it or restore it. But, as I am not booting using the disc, the options for the internal hdd are grayed out. I verified both the disc and the drive, the disc came out clean, while the drive reported issues (could that be the dealbreaker?) If anyone can figure out any solution for me short of taking a hammer to it, please please share it with me so I can possibly fix this issue from hell. If not, thanks for your time anyways.