I hope there's anyone can help me regarding on my HP laptop Presario CQ61. I'm using ubuntu 9.04 my problem is there's a speaker icon but there's no sound even I adjust the volume in 100%. Anyone can help me.. I'm also newly user of ubuntu and I want to learn I hope there's someone can guide me or give me the command in terminal to update my sound driver.. Thank you in advance and I really appreciate it if you can help me with this matter.

Best Regards