Hello Alain, I had this problem before when I'm using a USB headset in my laptop. Are you using USB headset? If you are using USB headset you need to configure your ALSA. Please check this link: <a href="http://www.cahilig.org/select-default-audio-device-ubuntu-804">http://www.cahilig.org/select-default-audio-device-ubuntu-804</a> Regards, Richard R. Cahilig <div class="gmail_quote">On Thu, Jul 2, 2009 at 10:04 AM, Alain Muls <<a href="mailto:alain.muls@telenet.be">alain.muls@telenet.be</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi ubuntu-users, If I use youtube, no sound is heard during watching. If however I download the video and play it in movie player, than everuthing works fine. What is possible wrong? --------------------------------------------------------------------- Alain Muls <a href="mailto:alain.muls@septentrio.com">alain.muls@septentrio.com</a> +32.477.675091 -- ubuntu-users mailing list <a href="mailto:ubuntu-users@lists.ubuntu.com">ubuntu-users@lists.ubuntu.com</a> Modify settings or unsubscribe at: <a href="https://lists.ubuntu.com/mailman/listinfo/ubuntu-users" target="_blank">https://lists.ubuntu.com/mailman/listinfo/ubuntu-users</a> </blockquote></div> -- Richard R. Cahilig <a href="http://www.cahilig.org">http://www.cahilig.org</a> <a href="http://www.aklan-linux.org">http://www.aklan-linux.org</a>