Brand new computer, but headphone jack on my toshiba satellite doesn't work. When I plug my headphones in the computer speakers still play. It is not the headphones (they work on other devices), and when I go to control panel > hardware and sound > sound it doesn't show the headphone jack. It only shows the Intel(R) Display Audio and Realtek High Definition output. Both are indicated as working. How do I get my headphone jack to work?