Audio Issues

Ok now I use Teamspeak to talk to friends online. On my old computer I had no
problems with it. Now I just bought this computer and it has HD realtek
Audio. When I push my button to talk they can not hear me half the time and
when they do they hear a high pitched hum and have to strain to hear me. I
have spent hours alone and working with one of the people adjusting my volume
settings, switching speakers and mics, and diffrent plugs. I have line in/Mic
in plus 2 other pink mic ports, one in back, one in front. Niether seem to
fix the problem. The mics seem to work as I have 2 and both have the problem.
My other problem with this is it seems to be stuck for karaoke cause when I
do speak, it plays in real time into my headset. I cant get this to stop what
to ever!! Iv used help and support to no anvil. Also my drives are up to
date! Any suggestiongs on what ports I should be using and what kind of
settings I should have would be greatly apprecieated. Thanks