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My built-in speakers won't mute?

I have a Sumsung laptop with Windows XP and Logitech speakers & subwoofer.

Yesterday, for some unknown reason, my built-in laptop speakers stopped muting when my Logitech speakers were plugged in. This is a big problem since my laptop speakers rattle a lot. There's nothing wrong with the Logitech speakers, they have a seperate power supply and they plug in where earphones normally do. I know the problem is with the computer because even when I plug normal microphones in, the laptop speakers still don't mute.

I don't want both sets of speakers to be on, only the ones plugged in. I've tried everything I can think of... can anyone else help?
Arissa K, February 2007
Does the PC have any programs that control the sound system? If so, check the settings, otherwise try to reinstal the sound drivers.

Darren, February 2007