I've got a 12" Rev. C Powerbook that I bought last November and it's got a problem with the headphone jack. The problem has been there since it was new, but lately it's really started to bother me. If I put even a little bit of pressure (towards the front) on a headphone plug plugged into the headphone jack, the PB switches the audio from the headphone output to the internal speakers. It's obvious that the switch that tells the PB when something is plugged into the audio output jack is on the edge of opening all the time and putting a little pressure on the audio jack opens the switch. Does anyone else have this problem? Do you think I should take it in for service? We don't have an Apple store here (yet), so I'd have to either send it to Apple or take it to an authorized reseller. I'd really rather not have to take it in for fear that it won't be in perfect shape by the time I get it back. What do you think?