I may have damages my AV controller

[inlayterms]

I moved my system on the weekend and, after hooking everything up, I realized that I had not plugged in some connectors properly. Long story short, I forgot to power everything down and unplugged the RCA cables from the controller and plugged them back in. In doing so, I must have touched the cables to the terminal and now all I get is a high-pitched ping from my main front speakers. I know my speakers are o.k. because my system is also set up for 2 Ch. and that works fine. I think I may have blown something in the "front outs" on the controller. If so, can this be fixed? Can it be anything else? I have a local repair guy who does great work, but I just wanted to know what I'm looking at before I take it to him. Thanks.