My speakers and headphone jack do not work/no output device?

I recently did a rebuild due to water damage on a 2009 macbook A1342. I replaced the uppercase, keyboard,and trackpad. All of the other parts are original. Since then, however, I have been without sound. The volume controls when pressed are dimmed and when I go into system preferences their are no output devices found. When I rebuilt the machine I saw no burns or anything that would indicate that any damage has happened to the MOBO, but I'm no expert. I was hoping someone knows the answer to this puzzle. Even if I can't fix it I would love to at least get a diagnosis.

Thanks

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If SystemProfiler->Audio does not identify the ports then they are damaged. Get a magnifying glass and check (both sides) the logic board for corrosion and/or burn marks... cleaning may help corrosion - otherwise it's live without sound or replace the logic board. (IMnsHO Soldering Logic Board components is not the "average" DIY sort of repair it requires special solder, tools & experience it's easy to thrash a board).

A workaround is to get a USB audio dongle... USB sound often works when the analog ports do not.

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i tried everything to try fix my 'no output device found' problem.

reinstalled twice even

in the end his technique worked for me

i've edited it a bit to make it easier to do it correctly

Step One: Open Applications.

Step Two: Find Utilities folder and open.

Step Three: Find the Audio MIDI Setup icon and open.

Step Four: on the MIDI page there will be the IAC Drive. If it Greyed Out, Select and click on “Add Devices”.

Step Five: double click on the IAC Drive, If the word BUS is in this box select and remove.

Step Six: Make sure that the “Device is online” is checked. Your IAC Driver Icon should be all red.

FINALLY RESTART.

I really hope this fixes the problem for others as it's immensely frustrating!

Good luck

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Hi I tried your method but I'm stuck on Step 5 the word IAC Drive doesn't seem to appear in my macbook. Any clarification would be much appreciated. Thank You

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sam lane will be eternally grateful.
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