You have a problem with the headphone socket. what I would suggest is play a file in media player and put the headphone plug in halfway and gently move it around left to right. You will know when it's fixed because the sound will start coming out of the speakers. This is a known fault that has been around a long time.
insert and remove your headphone. common problem with hardware not with the ROM.
Check this thread http://forum.xda-developers.com/showthread.php?t=267056
I hope it works
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