Audio out line problem

Are 6 year that there is this problem on all mac book pro i tried.
After stanby (closing monitor) external audio out line (headphone) never works!!! why?
I need to restart mac and after all works well...

Sounds like your coreaudio needs to be restarted. I don't know what's causing that, probably some software conflict. Is there some app that you have been using on all of those macs? For example, have you got some AV utility, MacKeeper or something else that runs at login on all those machines?
In the meantime, you should be able to get your audio back without doing a full restart. Just go into Activity monitor, search for 'coreaudio', select it in the pane and hit the Quit button in the taskbar. That'll restart the sound process.
Secondly, check your audio configuration here:
/Applications/Utilities/Audio MIDI Setup.app.
Make sure the window has the title Audio Devices, and click ‘Built in Output’ in the sidebar. Are any of the boxes under ‘Mute’ in the main panel checked? If so, uncheck them. Is the format set to 44100.0hz? If not, change it so that it is.

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