New
#11
Have a look in control panel for an icon for you particular sound card, be it VIA or Realtek, etc. Once you find it and run the application there should be options to reconfigure the jacks. Your Mic jack will likely end un being the center, sub channel. Some are auto sensing so just plugging in the cables may auto switch it. There should be a speaker test option in there somewhere too, to verify you've got it all plugged in correctly.