Ok I have no idea what is going on but here is the best explanation.. I have a Logitech 2.1 sound system and a logitech headset with mic. Now today I put in my headset and turned on the mic and was told in a game it sounded like there was a fan nearby, well there wasn't. So i just did some tests. I unplugged everything and plugged them back in, then opened sound recorder and had the mic turned off and did a recording. there was some low humming and it was messing up the voice. Well then I turned on the mic and there was a loud whining noise.. so I decided to try it on my laptop which is a HP Pavilion ze4900. I tested the mic and no background noise just my voice but very soft(maybe because the laptop's sound card is not like my SB Live card on my Pc... Also I noticed the when NOT using the mic like having it muted or turned off or even just normal speakers there is zero background noise. So my question is is it the headset or the sound system? Sooner i know the better because late tonight I'll be heading to Bestbuy for either both or one of them. If i knew a place to upload wav files and link them I'd show you what i mean.