I have a 17" iMac G5 that I got in October 2004. I had power issues, but my machine qualified under the Repair Extension Program and I had it fixed free of charge a year and a half ago. Now it won't start up. And if I do get it started, I can't put it to sleep without it shutting down. I had it serviced and the power supply is fine, but the folks at the Genius Bar are telling me it's the logic board ($950 to fix). I'm outside the 3 years that the Repair Extension Program covered, but I saw somewhere that Apple will continue to provide service on these iMacs. I didn't hear that at the Apple store I took it. Do I have any course of action other than paying to have it fixed or buying a new iMac?