I have just finshed building a new computer and its primarily goin to be used for gaming as i play call of duty 1&2, so i need my mic and headphones working properly, well since having the machine running my mic hasnt worked properly first of all it was too quiet so tht no one could hear me i had to basically put my mouth over it for anytin to come out, now after my dad did some messing about tryin to fix it, now what ever comes through my mic is now being played back in through my head phones ( I dont hav speakers ) however when i go on to the programme Team speak wen i speak into my mic nothing is being transmitted even though i can hear wat is goin into the microphone through my headphones, also when i am either opening a programme or website up i can hear a buzz which goes away once the window programme has come up etc , both me and me dad are at a complete losss as to wat is goin on so if theres any1 with any suggestions plz tell me as its drivin me mad

Is the sound (and ports) on board or did you add a PCI card?

If the former what is the make & model of the board? If the latter what is the make & model of the card?

Did you check everything under the Control Panel | Sounds and Audio Devices ?

Also perhaps:

Resources for Troubleshooting Sound Problems in Windows XP

its onboard ports, the motherboard is a gigabyte one and it comes with Realtek HD audio hardware, weve tried everything looking on the internet, troubleshooting, could any of the above be caused by the fact tht you need a High Defintion mic and pair of headphones, but when i go to control panel sudio/speech and then click voice and test hardware and i test my mic i hav to get rite up close b4 anythin comes out, ok thts no prob, but then the next screen comes up where u can hear wat is goin into the headphones if i jst tapp the mic lightly a feedback loop occurs, and also as i said above wat ever comes through my mic is heard through my headphones this is frustratin the hell out of the both of us!

What is the gigabyte model #? What is the headset model & #? Perhaps the specs would have some clue. I would suspect a possible compatibility issue. Do you have another headset to try? Is it a single plug or how is it connected to the board?