There's a reed-switch inside the port that detects optical audio connectors and
shuts off the analog audio systems. If that reed-switch gets stuck, as it often
does with the older models, then it restricts the laptop to optical connections
only. Your most reliable bet, if compressed air doesn't work, is to get a USB
to audio adapter and run the sound through that.
Unfortunately the connector port is soldered onto the motherboard, so
replacement is extremely expensive.
Regards
Sam
MacAmbulance Ltd.
Providing Affordable Mac/PC Support and Web Development
Sam Mullen ACMT
+44 (0)7747778022
[email protected]
www.macambulance.co.uk
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On 29 Jan 2014, at 20:44, Davies Steve <[email protected]> wrote:
> My 4 year old 15" Macbook Pro has developed an issue where the sound doesn't
> work unless a headphone or speaker is plugged in.
> This happened intermittently with the sound coming back every now and again
> but now seems to be becoming more permanent and red light also shines out of
> the headphone socket.
>
> When I go into system preferences it doesn't recognise an internal audio
> output.
>
> It does fix itself occasionally but it hasn't done so for some time.
> However the problem returns again as soon as a headphone / speaker cable is
> plugged in and unplugged again.
>
> Any ideas would be appreciated.
>
> Thanks,
>
> Steve.
>
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