Sound from computer nolonger goes out through HDMI cord. Picture does. How can I fix this?

I have a HP Pavilion dm4 entertainment laptop with Intel core i5 m430 2.27GHz.  Just recently - when I plug in an HDMI cable connected to the TV -  the sound does not go to the TV.  Previously it did.  How can I determine what has changed to prevent this from happening?

Sorry - I meant dm4.  Thank you for responding so promptly.  Since I originally submitted I found  the solution.  I couldn't get it to change from the default laptop speakers  in the sound mixer in the taskbar but when I went to the sound settings in the control panel with the hdmi plugged in and made the samsung TV the default speaker it went to the TV.  I thought I had tried this before but in any case this time it worked.  Again - I thank you for responding so quickly.  Next time I may really need the aswer quickly.

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