If you're using Windows 7, which came with most of these models, have you made sure that the audio and mic are enabled? What type of speaker do you have installed and do they work? In order to hear from the headset, you frequently need to disable the speakers.
See the link below for basic instructions for enabling the mic.(Control Panel-Sound-Recording tab, etc.) Settings for the headset should be in the same panel:
Hope this helps.
I have a gateway ZX4300 all in one computer. I bought a new headset and plugged it in. one plug for audio and one for mic. It is not being detected at all. I have no idea why. Any ideas?