Question : Problem: Acer Aspire notebook audio congifuration

I just bought an Acer Aspire 3680 notebook that ran Windows Vista. I formatted the disk and installed Windows XP SP2 and updated. I am having a problem with the audio. The sound is a Realtek High Definition Audio.
The problem is that although the internal speakers work fine, when i plug in headphones into the headphone jack, which is labeled SPDIF, it gets sound for a few seconds, and then it is gone. And i cannot figure out how to mute the internal speakers of the notebok without muting hte headphones too.

Any suggestions? is it a software or hardware problem?

Answer : Problem: Acer Aspire notebook audio congifuration

http://www.acerpanam.com/synapse/forms/Acer_drivers.cfm
Check the link 49.
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