i'm using ubuntu 10.04 and now my laptop don't play the sound while i'm playing music. I lost my top & bottom panel too. please help to solve the problem. thx

kill gnome-panel

open the terminal and type

killall gnome-panel

Missing panels, uh?

Well you should try this little script which I find very handy for restoring (and even saving!) GNOME panels in Ubuntu.

Hope it helps you!