Among other diagnostics and guesses, especially if you recently added a new application, you might launch Activity Monitor (Applications> Utilities, likely). Some less-well behaved applications hog processor time. Daniel Kegan * daniel at keganlaw.com * Kegan & Kegan, Ltd. Balanced Counsel for Smart Clients * <http://www.keganlaw.com> * * * * * * * * * * * * * * * * * * * * * * * * * Begin forwarded message: > Date: Wed, 01 Dec 2004 16:47:29 -0600 > From: John Lyon <jelyon at mac.com> > Subject: Re: [Ti] Design and/or heat dissipation issues? > My 550 didn't *use* to run hot, but now the fan kicks on in high gear > with a > high degree of regularity, even when it's doing not much more than > serving > audio via iTunes and running Firefox. Odd. I even did a new install of > 10.3 > > On 12/1/04 4:17 PM, "Adam Boettiger" <adam.boettiger at pobox.com> wrote: >> Mine's running hot with the fan on all the time, regardless of >> whether it is >> plugged in or running on battery power.