Microphone. ive got a fujitsu siemens amilo notebook laptop and im not sure if it has a built in

Question

ive got a fujitsu siemens amilo notebook laptop and im not sure if it has a built in microphone but i cant get it working. could you please help me. if i goto yahoo and use the mic tester and have music playing it works but if i mute the music it tells me my mic is not work