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On your computer do you happen to know the driver for your audio? One popular one is named "Realtek". It is through that driver where you can change the settings to allow your headphones to work...

Most modern computers allow you to have sound at more then one source. That is why I asked if the computer had sound at the same time as your hdmi. If your hdmi has audio passing through it then...

When you have the HDMI cable plugged in do you have sound on your computer or does it cut off?

HDMI to tv. Then audio out from tv to your stereo system. Do the headphones work along with the hdmi already at the same time ?