The OVERTEMP red LED keeps lighting up on the system board of my Power Mac G5 2.3GHz. Obviously something is overheating. I called Apple Support and he asked my how long it has been since I turned off my Power Mac. I told him its been 2 years (since I bought it). He said that I need to turn it off once in a while for some time. I use it to serve files so I can't turn it off. Sounds kind of ridiculous if you ask me. He said that if it continues to happen I need to take it in for servicing because a fan could be broken, etc. I am wondering, does anyone know what part of the system that the OVERTEMP led is related to? I asked the Apple care guy and he said that it was the memory. The LED is located next to the top memory bay along with 4 or 5 other warning LED's (e.g. CPU A, . I'm not convinced that it is related to the memory temperature though. So I thought I would ask all of you knowledgeable Mac owners if you know what the OVERTEMP LED is monitoring? Cheers.