OS X broken or my laptop?

[mark28]

Sometimes when I start up my MBP, the sound is disabled. It has a circle with the diagonal line in it at the buttom of the speaker icon when you press one of the volume knobs.

The fix I found is simply take my headphones, plug it in my MBP, remove it and then the sound works then.

Is this an OS X problem, or do I need to call Applecare?

 

[deadwulfe]

Try blowing air into the headphone port. There's a sensor inside there that may be covered with dirt.

 

[dime21]

your headphone jack is dirty. the speakers are disabled because the sensor is sticking and it thinks you have headphones still plugged in.