Mercedes w211

Mercedes » E-Class » 2003-2009
Question

So i have a 2008 mercedes e350 . when i first got the car i pulled out the head unit (radio) and chenged the ipod connector to the auxilary port in the glove box. It worled fine for months and now neither work the aux or the ipod connection. It connects but no sound ?

Everything else on the radio works fine . 

Please help with this issue thanks...