I bought the Astro A40's for my PC. The PC edition does not have the mixamp. I have a problem with the boom mic. I can use the in-line mic with my PC just fine, but when I switch it to the "A" setting my computer will not pick up sound from my mic. If I plug the boom mic directly into my PC, it works. When I plug it in my headset, it doesn't. I have read that there is internal wiring problems. Is that what is broken?