Optical sound problem after logic board replacement

I do not have any sound on mac osx on my laptop and sometimes there is a red light comming from the jack port. I've tried going to Sound in the system preferences and it only sees "optical audio" for output. And i've also googled the problem and tried resetting smc and whatever and deleting audio cache.

I also have windows with bootcamp (need it cause i'm a web developer and i need to test things in ie) and on windows the sound works (through the speakers) but it does not work if i plug in a pair of headsets and the red light is on (in the jack).

My question is: is this hardware or is it software? If i reinstall mac os (which is a god awful task - since i have a lot of files) will it work properly?

I've changed my logic board recently due to water damage.

Also, on an unrelated topic my light sensosr only works for the keyboard and not the display as well.

Note: my sound worked properly for some time. All of the blue it started not to work. D not know why.

Note 2: when the service gave me my mac back it had no serial so i used blank board serializer 3t110 to write my serial myself. First i tried with 3t106 and it did not work. I'm saying this because it happenned around when i was doing that.

Answered! View the answer I have this problem too

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Chosen Solution

Go to this site and download the latest driver for Windows OS that your running: http://support.apple.com/downloads/#boot...

Save the DMG to your USB stick. Now boot into your Windows partition and load the DMG from your USB stick. The new drivers will overwrite the old drivers and you should get sound back and that annoying light should go away inside the headphone jack.

Update

Also, try inserting your headphone plug forcefully in and out a few times and then wiggling left and right while it's inserted.

If that don't work then get you a strong magnet and wave it across the headphone jack port a few times and also move the magnet forward and back from the headphone jack port.

Try the above three things and that should make you right as rain.

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