The fans on my white Macbook seem to be constantly running faster than they should since 10.6.6. I only use this Macbook for surfing the web and before 10.6.6 the only thing that would cause it to heat up was streaming video. Now as soon as I launch Safari the temperature rises to 60 degrees and the fans go up to 3000 RPM. This is not molten of course but it is audible. I should add that if I use a different browser (Opera 11) the temperature stays lower and fans spin less (53 degrees and 2500RPM). When 10.6.6 was released it caused my Macbook to slow down and have a lot of beachballs. I took the opportunity to upgrade the hard drive to a 7200RPM one when I did a re-install. I didn't think this could cause the CPU to run hotter but maybe someone out there knows something I don't? Is the likely cause the 10.6.6 update or the hard drive? I've reset the PRAM and SMC already with no change. Activity Monitor shows no unusual CPU usage or rogue programs. Specs are 1.83 GHz Core Duo 2GB RAM 160GB WD 7200 RPM hard drive Intel 950 graphics.