Today my iMac did something unusual. I was surfing the net and scrolling through the screen with my mouse and my imac shut down by itself. I bought my mac back in feb and have all the software updates. Also there are no schedules in the energy saver to shut down at a specific time. I am starting to get paranoid and wonder if i should bring it in to the apple store. Is there something that could have caused this? I should mention that i am connected to a surge protector, nothing else on the strip shut off. Any help or advice would be appreciated, thanks!