G-max 2100 Recording not possible

Dear Madam, Sir, I have had the Gateway Multimedia speakers G-max 2100 for quite a while now. For the past 2 years they were not hooked up to my computer. I just hooked them up again. The sound through the speakers is fine, also the sound trhough the headset is fine. I just can not seem to record any sound through the microphone of the headset. I have checked all settings for the microphone, but nothing seems to work. What can I do?