I have an iMac Software Version 10.4.11 (tiger) and my Problem is, Whenever I plug headphones in The sound is locked and it gives me the little locked circle, however sound works whenever I unplug the headphones. I've been searching threads for an answer put most people seem to have the opposite problem. I've checked my sound settings but it seems to be locked and cant adjust it if the headphones are in. I Often always keep my headphones in too otherwise Parent's complain about my music being to loud. Hopefully this is a easy fix, I'm up to try anything your all are willing to write and help... Thanks for reading and pleas help!