My dad has an iMac G5 from the generation before they got built-in iSight cameras. Last week, I noticed it was being a little difficult by kinda shutting down for no reason when IT wanted to, not when people told it to. It sometimes doesn't even boot up all the way, and it won't stay on very long. I tried plugging it into another outlet and still got the same issues. Anybody got a clue what's going on here? It sounds like a power supply problem to me or some failsafe in the computer that's tripping a shutdown. I didn't want to drag it up to the Apple Store until I asked the **EXPERTS!** on here since I have never taken a desktop to the Apple Store (or anything out of warranty).