Hello everyone, this is my first post. I've been on macrumors everyday for about a year now (since a few weeks before i bought my first mac) and finally decided to sign up. This 1GHZ, powerbook g4 12" aluminum with 512 ram and a 60gb hdd has a very VERY loud cpu fan. So loud that when its on you can hear it in another room, even over the TV sometimes. Now, I've perused the web in search of a fix and tried EVERYTHING as i thought it was a software problem at first. Then I realised the fan's speed doesn't change at all, ever. So i bought a replacement fan and fitted it, it does exactly the same. I then formatted and re-installed OSX to no avail. Anyone got any ideas what it can be? It's just running full blast all the time, and the temperature of my system never gets above the fan threshholds. Thanks in advance and kind regards, James.