I have no sound in my computer, only with headphones, i tried the software update but it still doesn't work, and i have a red light on in my computer.

I have no sound in my computer, only with headphones, i tried the software update but it still doesn't work, and i have a red light on in my computer. How to resolve that  ?

Plug and unlpug the headphone jack with some intention to get the mechanical switch to flip.
You can google for more intrusive methods. 
ex. Read through all the many approachs: http://www.ifixit.com/Answers/View/8797/Audio+jack+problem,+no+speaker+sound,+re d+light

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