When I switch desktops on iMac the speaker does not switch with it

When switching desktops, the internal speaker does not work from one to the other.  I have to insert a ear piece end into the jack to get it to work....it is as if it is on mute when the speaker was working fine on the other desktop.  I checked the settings for sound on both desktops and nothing appears amiss.  What should I do?  I can get it to work by inserting the end into the jack but it is annoying for it to be done everytime I switch to my desktop.  I'm muted until I do!

Have you done a PRAM reset, CMD+Option+p+r...
http://support.apple.com/kb/HT1379
In fact, do 3 in a row, takes a bit of time.
Open Audio Midi Setup in Applications>Utilities, see the input & output options & KHz setting there, some things will change it for their own use, then not set it back.

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