Input jack

Hi,
my input jack is failing : when nothing is plugged, it appears to switch to optical (red light comming from inside). No sound from the speakers.
When I plug in (headset or audio system) it works fine. As soon as I unplug it goes back to optical.
I have been told the fix would need a replacement of the mainboard...
Any solution (by the way it happen just after 1 year...)

It is a mechanical switch.
By plugging and unplugging the jack with purpose you maybe able to get the switch to flip.
You can try a non metal item inserted to flip the switch- caution of course in this method at your own risk.
It is soldered to the logic board.
check your warranty:
Genius reservation http://www.apple.com/retail/geniusbar/
on-line https://getsupport.apple.com/GetproductgroupList.action
check warranty https://selfsolve.apple.com/agreementWarrantyDynamic.do

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