I noticed ever since i have my alienware, few months back, the sound has always been a problem. I updated to the latest Bios and audio drivers, but the voice would sometimes become very soft until i restart it.
Exactly what BIOS and audio drivers did you install?
Did you "clean-install" the audio drivers?
Are you using the internal speakers, headset, or HDTV speakers?
If headset, is it analog or digital (USB)?
With more data, someone will have a better chance of helping you. Also, if under warranty, have you spoke to phone-support about this problem?
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