I have regular speakers hooked up to the back of the computer for several months. I also have a microphone jack and a headphone jack on the FRONT of the computer. If I remember right, when I would plug in the headphones in the front of the computer, the sound would then come from the headphones, and STOP coming from the regular speakers. Now, when I plug in the headphones in the front of the computer, there is no sound from them, and the sound continues coming from the speakers. I also checked the microphone jack on the front of the computer and it does not work. On the back of the computer (not a name brand) there are three small jacks. There is a green one where I currently have the speakers hooked to, and they do work. There is also a headphone jack and a microphone jack back there. They do not work. Running Windows XP Pro. Is this a hardware or software problem / Many thanks in advance.