Speakers not working when using external monitor

I'm using an HP Envy laptop and HP Pavilion 25bw external moniter connected via HDMI cable. Using Windows 8.1. When the laptop lid is closed the sound is turned off. If I open the lid I get sound for about 2 seconds then it goes off. If I remove the HDMI cable, the sound comes on. How can I get the sound to work with the 25bw connected and the lid closed?
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Hi,
Please try to diable HDMI sound from Playback devices
  Right click the speaker icon,
  Select Playback devices
  Right click HDMI sound
  Disable it.
Regards.
BH
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