Hey there! Thanks to all you good people first of all. I have been using speakers with my PC which work fine. Now I have wanted to talk to my friends on line so I tried to plug in my headset with attached microphone. I can hear fine on the headset(listen to music hear sounds on theweb etc.) but I can't hear my voice or use my microphone for talking to people.
My headset has 2 jacks which I have plugged into 2 sockets at the back of the harddrive.
There is no voice. Do I need to do something to hear my voice or to configure microphone settings on the computer? please help me, I can't figure it out. Thanks XX

First, if you have color coded jacks at the back of your case, make sure the microphone is plugged into the pink jack. Go to control panel, switch to classic view if not already done, Sounds and audio devices, press the Advanced button that is into the device volume panel, if you see the microphone slider skip what is in brackets
( options, properties, check microphone, press ok ), make sure it is not muted and you can play with the volume slider there

-This may be the problem.
Click audio controls on the taskbar, go to advanced under Master Volume. Make sure that center speaker and subwoofer isn't connected to microphone. Just uncheck both, unless that option is required.. worked for me.

I'm having similar problems. My headphone/mic set up is plugged in correctly. Well, I can hear all playback and can record in to my computer using the mic, but can't hear myself in the headphones when talking into the mic. Does that make sense?

Some audio cards have the option of playing the sound from mic directly to the audio output, and some don't. Mic is primarily an audio-in. Check the properties on your volume taskbar. There should be a slider labeled "Microphone". If it is not shown, then you might need to check the microphone checkbox in the options/properties. If you don't see microphone in the list of volume controls, then your audio card doesn't support it.

hi i have a headset but, it's not working. i have the usb headsets. i can hear really find but, when i want to talk to someone they say that they can not hear me i check all the settings but, it still dont work. can you help me thanks

Control panel/sound and audio devices/Advanced (button in "device volume" box)

In the volume control window:
click options/properties
select "recording" (make sure that microphone is checked in a box below)
click "ok"

now you can choose the sound source and adjust its volume. Click on Mic's "select" checkbox and volume it up. If you see "advanced" button below the checkbox, then you could give it more boost, or change whatever the options are. If you want, you can click options (on the menu bar) and check "advanced controls" to enable the that "advanced" button.