My AUX suddenly stopped working

Jul 5, 2018
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I have a 2008 VW Jetta and at first the AUX input worked fine and I was able to play music off my phone. But recently my battery died and after changing it, when ever i plug the AUX chord in, it doesn't work. I have searched evrywhere abd tried everything. All solutions I have seen so far is to replace my stereo. Which I think is outrageous. Please help.