Why audio volume starts working after turning OFF a monitor ?

My Operating System is Windows 7  64 bit.

I have Hewlett Packard(HP) EliteBook 850 Laptop connected to Two monitors.  HP L1710 monitor and HP EliteDisplay E241i monitor.  

The audio volume is not working.  I'm not getting any sound.  When I turn OFF E241i monitor, then volume starts working.  Why?
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naseeamAsked:
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serialbandConnect With a Mentor Commented:
What kind of connector do you have to your monitor?  You might have some sound drivers set up to incorrectly switch speakers to a nonexistant external monitor speaker through HDMI.  You should be able to set the speaker output to your laptop instead of external in the Control Panel.

I've had a similar thing happen with Displayport.  I had to force the selection to laptop speakers or headphones.
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naseeamAuthor Commented:
It's a DVI connector.  I was able to setup speaker output to my laptop.

Thank you!
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naseeamAuthor Commented:
Expert found the root cause of the problem.
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