Hi, Simply, my White (early 2008) MacBook 4.1 is struggling to run HP Photosmart Studio, an app that was bundled with the HP C4280 which came with my MacBook. (spec = 2.4GHz Core 2 Duo, 4GB RAM, 17GB remaining on the hard disc). With the app open and not being used for anything I am getting the following temperature readings: CPU Core A: 71 (degrees C) CPU Core B: 71 Main Heatsink 1: 58 Main Heatsink 2: 58 Enclosure Bottomside: 26 The cooling fans are running noisy (5500 rpm). My house temperature is cool (think winter in the UK). When I try to edit a scanned image (even a credit card sized image scanned as a JPEG at 200 dpi) the software often freezes for at least half an hour before I have to Force Quit. I haven't had the MacBook misbehave before when running iMovie, iDVD and other intensive apps. I have downloaded the latest version of Photosmart from HP's website and the problem remains. Also, I have a 1.66 GHz Core Duo, 2GB RAM Mac Mini that doesn't seem to have the same problem, although I haven't pushed it as hard I have the MacBook. What is the problem?? Is there a problem??