OK, I think I'm on to something. First of all, this problem started when I upgraded to 10.2.5. Now, the clicking is related to running on battery power. When I plug in the power cord, the clicking starts. I've got to replicate this a few more times before I report it to AppleCare. Ron On Monday, April 14, 2003, at 07:50 AM, Gary D. Adams wrote: > > I think Ron is running OS X, though, but not sure if it's 10.2.5. You > can have a clicking sound without it being the hd going out!