I bought a a/v component switch for my pc cause i actually have two pc's and a xbox 360 and ps3 and only one set of speakers for all those. I figure i would just use a a/v switch to swap between them for the audio. Ps3 and 360 connect to computers monitor through hdmi switch and i have the audio going out through rca cables to the av switch. The monitor doesn't have audio out btw. Well I figured this would solve everything but what i noticed is i was getting a feedback noise when i got either pc selected. It's very annoying, it doesn't happen if I have have one pc connected to the switch and the line out to the speakers. If i connect any other device to the switch i get the sound. It happens with either pc connected to it. I bought a new switch thinking it was a bad a/v switch yet the problem is still there. I figured a/v switches would cut off other devices when they aren't selected so im not sure where this feedback is coming from. It also happens if i switch out the speakers for headphones. Ive tried connecting and unconnecting devices to the switch multiple times, different combinations but it's always there. This is very disappointing, any ideas what's causing this?