May I ask why? Just curious. I’m in my 11th month of owning one.
Sure. My first iMac was a G3 and it overheated. My second one was a G4 and it overheated as well. If yours ever starts shutting down for what appears to be no reason, back up all data immediately. The CPU is shutting down the computer as a safety precaution because of overheating. There are free programs for the Mac that monitor your temperature.