I have a Samsung HT-E5550 1000W Smart Home Cinema System. Only the subwoofer and the little Centre front speaker are connected to the main unit, which in turn is connected to my pc's audio card via aux cables. That's it, for the time being at least.
When I turn it on, I set it to the aux mode and the music from my pc starts playing regularly, but after a while the main unit starts switching beetween the different modes: no Disc, Aux, Fm R. IPOD, HDMI, BT, BLU-ray, etc. I haven't yet understood how to set it only to aux for good. Could this be a bug? It is very annoying.