Hello. I'm having problem with my Galaxy. It just don't play any sounds on spekers(front and back-one) and internal microphone does not work (so I can't play music on speakers or make calls). 3.5 mm jack works fine, also external microphone. I used it like every day and this morning when I called my friend it didn't work... Anyone have idea what to do?? Maybe returning to factory settings(how can I do it) ? Sorry for my bad english, hope you understand my problems.