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I'm going to assume you are running alsa, since you haven't really given anyone much to go on.
Have you tried running alsamixer and checking if it is muted or the sound is turned down? (I do this all the time and then curse at my computer for not having sound!)
Other than that, we will need more information. Did you change anything before this happened? Are you using Alsa and what sound card do you have? The output of lsmod | grep snd, and anything else you think is relevant.
What happens to me sometimes is if I run something like Realplayer, and turn down the sound in that player, if I later play something say in Mplayer the sound is to the same level as I left it in Realplayer. Even if I have my volume on my desktop mixer all the way open, it is still hard to hear.
Until now I found you can open the audio program you turn down the sound and turn up the sound again. Or you need to reset the volume of your mixer, a simple reboot not always fix it.
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