E-Machines eMachines Desktop PC "plug front mic ear plugs" Questions

mic plugged into the front but can only get the microphone to work. I am using SKYPE and woudl like to leave the speakers on for most functions but would prefer to hear conversations in the ear phones

...mic/earphone ports. 3. The three plugs that go to front panel; H.D.D. LED (RED/WHITE wires), Power LED (GREEN/WHITE wires) and Power Switch (BLACK/WHITE wires). Does anyone have a layout of mobo or ...