>>>> I have an couple of months old iBook (14" ,700 MHz) with Mac OS X >>>> 10.2.4. Starting from few days ago, the cooling fan works almost >>>> all >>>> the time when the iBook is on. When I start it it does not blow, but >>>> approx. 15 minutes later or so it starts blowing and doesn't stop. >>>> >>>> Why this happens? Is it bad to work like this? Has your room temperature changed? This happens to me when the air temperature is not quite warm enough for me to turn on the air conditioner. My tiBook fan will start howling and when I turn on the AC, the fan stops. So there is some critical air temperature, and maybe humidity level, at which the fan cycles on or off because the heat is not being dissipated. Also, some applications cause more cpu activity than others. Minimizing the number of open applications can help reduce heat. --- Break the Rules! Use a Sprint PC Connection Card with a tiBook: <http://www.powerpage.org/story.lasso?newsID=10220> jackrodgers at earthlink.net http://www.jackrodgers.com