Mic no longer working.

Hey all,
Basically, at the moment i use in ear earphones, plug them into my laptop and play counter strike, this worked perfectly for a time, sound came through earphones and i could use the laptops built in microphone to speak to my friends on teamspeak etc, now i only get the sound but no one can hear me speak, if i unplug the earphones, they can then hear me, anyone got any ideas?
Cheers

is the mike intergated in your headphones?

Nah its the laptops own one, it worked previously but all of a sudden stopped working.

have you checked your sound drivers?