I've got Windows XP Home Edition. I've had the computer for two years. The DVD and CD/RW ROM work fine. They play all the audio/video CDs I have perfectly fine. But when I plug in my new headphones nothing happens. No sound comes through the headphones. The sound continues to come through my external speakers and if there is an video it continues uninterrupted. I've taken the headphones and plugged them into my separte unrelated to the computer amplifier and tuner system and the headphones work fine. I am stumped!