i have a 1.33 Ghz 12" powerbook G4 and a 1.25 Ghz Macmini G4. i hear the fan macmini roaring when ever i do a processor-intensive thing. (mostly viewing a video online or in quicktime. i don't have photo shop or any other program that likes the processor a lot.) on my powerbook, i have never heard the fan ever. i already had the harddrive replaced once because i ook the powerbook in and it was diagnossed as being so slow because my hard drive was fryed. i don't use the powerbook as much online but i still never hear the fan. is this something i should go back to applecare again about?