GA-M61P-S3 sound and microphone issue

I've got an issue with a GA-M61P-S3 MB's sound.

My main issue is that I can't seem to get the microphone to work well, or right. Using TeamSpeak, everyone tells me the depth isn't there anymore (using a non-USB Logitech microphone that works well on another computer). I can tell there are issues on my side as any sound that I put into the microphone is put back out through my speakers (even when TS isn't being used).

Sound-wise, I am only using the green jack to power a speaker/sub combo that only uses one line-out wire. I do get sound, but it's only coming through the right-side speaker.

I have the Realtek HD sound driver installed, and have played with more microphone settings (from different screens) than I ever knew existed.

Considering the capabilities for sound that this MB has, I know I need to get something cleared up.

I'd appreciate any help.