Temps for my powerbook using Temperature monitor are 51c-processor 55c-power supply bottom 33c battery 38c for hdd. Thats an Idle tempurature. Pb is a 15" 1.33 g4. Was about 5-7 degrees hotter but got a Laptop2 pad but it only cools it down if the back legs are down. I have never heard the fan come on but it's fan might be more quite than the 7+ fans in the Xeon system thats next to it. Is there any way of turning the fan on I'd rather have the fan going than to fry the powerbook.