Hi, Wondering if anyone has experienced the same thing or knows what's going on with my Powerbook. I kept hearing a metallic clicking sound every once in a while coming from my laptop -- almost like something was snapping in there. I took it to the Apple store because my computer was having issues starting up and they replaced the hard drive (for $300). BUT, I still hear the clicking sound. I took it back to them and because I can't make the computer do the clicking sound on demand, they won't do anything about it. Has anyone else had this happen?? My computer seems to be running fine now, but I'm just worried that it'll have a meltdown soon. Thanks!