sound loss when going from internet source to computer source

[Gary Kirkpatrick]

If I load firefox and listen to anything over the internet and then attempt
to play an mp3 using rhythm box or movie player, there is no sound and in
the case of rhythm box, the position bar does not move.  If I reboot, then
rhythm box and movie player work normally.  If on the other hand I were then
to try to listen to anything over the internet, then there is no sound
unless I reboot and start with the internet.

I use 'auto-detect' for sound but have tried ALSA, OSS and pulse with the
same results.

I have a DEll Inspiron 600m with a built in sound 'card.'


Thanks for any help.

Gary
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