Having a MBPr late 2013 and having a sound problem the sound does not come tom the headphones even its all the way up and when i remove the headphones it docent come out the internal speaker either ? any idea how i fix this?

Question

the sound do not come out the headphones sometimes altho its all the way up in the setting and when i remove the headphones the sound doesnt come from the internal speaker either and only a reboot fixes the problem and thats annoying! any idea how tto fix this?

Answer 1

Hello. I've been able to play sound without problems through headphones or external speakers to date - the output always switched to these automatically until today. Now, sound output continues through internal speakers even if I plug in headphones or external speakers.
- I tested the headphones and speakers on other devices: they work fine.
- When I plug in headphones or speakers into the audio output port (I have verified that I'm not using the input jack) the devices are not detected and are not listed under the output tab in system preferences-sound.
I concluded from this that I probably had a problem with the audio port, so to test that I tried the following. I plugged a powered multi-USB device with ports for microphone line-in and headphone line-out into the USB port and switched it on. I verified that it was working by plugging a USB stick into the multi-USB device - this was recognised successfully, so the device was clearly working. I then plugged in headphones and speakers into the audio line-out on the multi USB device - but still no sound came through them (and tey were not listed among output devices) and the Mac continued using internal speakers.
What should I do? Does the latter test suggest that the problem does not lie with the audio port, or is my test not conclusive? What would you advise?
Many thanks indeed!
NG