Does your SN for your iMac end in TAR?jemroc said:Had the same problem with my 20" iSight G5. Made this buzzing noise the first time I started it up out of the box. I'm curious how widespread this problem is considering that several people have mentioned that their iMacs are whisper quiet. Perhaps Apple corrected this problem in their later batches. Is there any way to determine the manufacture date of an iMac? I bought mine just last week, but it still shipped with Mac OS X 10.4.2, which is pretty dated.