hifi engine

Onkyo Integra A 9911

I connected macbook pro to Integra,everything was fine for two weeks...out on mac's phones to tuner input on a amplifier but then troubles started,input selector slipped through and I lost tuner input,line too,basically no sound at all...disc player works but ...what a hell is going on?I tried to restart soundcard on a Mac..nothing seems to work anybody knows what happened? Is it possible to burn inputs?Selector works scatchy too kind a tighten it up but the sound not the same.How's possible on a source selector stand and input(line) selector stand to hear disc player?