this is an attempt to help everyone that posts messages about sound...
run /sbin/lsmod, post the output
run /sbin/lspci, post the output
run alsamixer, does it work? Press ESC to quit
Is External mixer unmuted?
Is Master unmuted? At a reasonable level, other than 0%?
Is PCM unmuted? At a reasonable level, other than 0%?
What is your laptop model, if applicable?
what is your sound card model?
Does "cat /dev/urandom > /dev/dsp" work? Press CTRL+C to quit.
Is your sound knob on the side of the computer/speakers turned up reasonably?
Include this in your posts, please... I think I'll bookmark this post and repost this on all messages concerning sound that don't have the information asked above.