No HDMI Output device on sound playback devices list

I run a 8.1 Windows 64 bit edition on ASUS vivobook. My graphic card is Geforce 740M. I don't know why but there is no HDMI output device in the playback devices list, so I can't play sound through the TV when I plug the computer to it. Help!! =[
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  1. Best answer
    First update your drivers for the Vivobook
    The try:
    Control Panel --> Sounds and Audio Devices --> "Audio" Tab ---> Change audio playback to "Realtek HDMI Output"

    If not, try a "Digital Output" option

    You may have to reboot after making the change to get it to work.
  2. I completely uninstalled and reinstalled the intel graphic card driver, and it worked =]
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