Hi, I am new to the forums, and I tried to search for a thread that addressed this exact issue, but I was unable to find quite what I was looking for. I apologize if I am posting a question that has already been answered. I have an iMac G5 iSight, and when I power up, the tone comes on, and the screen lights up. An Apple logo does show, and the gear starts spinning. After about a minute, the fans kick on. I managed to boot from the repair disk that was shipped with the computer. I am able to (i) enter the disk utility and/or (ii) install OS X. However, upon launching disk utility, disk utility is unable to find any disks whatsoever, even after scanning for about 15 minutes. Similarly, I can choose to install OS X, but it only gives me the option of installing to a network drive. [I have a ReadyNAS that I would be happy to use as the boot disk for the iMac, but from what I have read on this forum, it seems that this is not possible and/or feasible.] Obviously, this computer is out of warranty. I would be happy to follow the instructions about replacing a hard drive if that may be the problem, but I'd like to have some encouragement that the hard drive is indeed the problem. If it is the hard drive, is there a list of compatible replacement hard drives? Happy Holidays, and thank you for taking the time to read and reply to my post.