Sound connection problem through HDMI

[ohdavid42]

So, I format my laptop for it was getting slow and annoying with all the stuff I download but don't remember what they were.

I installed the window 7 and all the necessary driver for it to functions and I've been doing fine for 4weeks

But, recently I wanted to watch a movie, and I connected my HDMI with our TV.
Here I started to see problem. The display works just fine through the TV, but the sound will come from the computer speaker. I checked if graphic card driver was wrong so I reinstalled the most recent driver from NIVADA. And it still won't fix. Any help??

MY computer is : http/www.cnet.com/laptops/dell-studio-xps-x1340/4507-3121_7-33695977.html

here is the specs

 

[das_stig]

You need to ensure that the default audio output is nVidia HDMI when connected to TV.

 

[spiketheaardvark]

Have you selected the video card HDMI as the audio device?

What I do on my is to set the HDMI as the default audio device. That way, anytime you plug the hdmi it will be used for audio. unplug it and it will use speakers or headphone jack instead.

 

[ohdavid42]

You need to ensure that the default audio output is nVidia HDMI when connected to TV.

Yes, but the problem is the audio won't detect the sound. From the control panel>sound there is no audio device for HDMI output when it was connected

 

[das_stig]

If no HDMI audio device, then driver not installed correctly. Check device manager, do you have an entry in there or yellow error icons?

 

[ohdavid42]

If no HDMI audio device, then driver not installed correctly. Check device manager, do you have an entry in there or yellow error icons?

I just checked but there seems to be no problem. the sound have both driver "IDT high def audio codec" and "Nvidia high def audio"