That's exactly all my iMac (2 1/2 years old) has. AppleCare determined on the phone with the instal disk that it isn't recognizing a hard drive at all. I took it to an Apple authorized service center to see about saving any data. He took a quick look and listened to the crazy tones and said I was getting nothing off that drive. I have an appointment at the Genius bar tomorrow. Switch out the hard drive? Any chance in your experience I can save anything?? Good as new after the switch?