I just built my computer, and almost everything is running fine; however, i am having some sound issues with certain DVDs. When i put in some DVDs into the DVD drive the video and audio will be fine, but when i put in others (Naussica, etc.) the video will be fine but not the audio. I won't hear anything. Does anyone know what might be causing the problem?

You should make sure you aren't having a sound issue with dts decoding, because without a dts decoder, you will hear nothing. I have had alot of issues with 'backing up' some of my dvds and trying to play them at a friend's house without a stereo that can decode dts sound, though most dvd's come with a standard stereo sound channel and up to dts or thx.