HDMI connection not found!

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well , i have a dell xps laptop! and it is connected to sony bravia via hdmi cabel,....i can see my desktop but there is no sound! i checked the playback devices option its showing hdmi not plugged in and its grey that means it not an active option and i cant set it to default! Sometimes my laptop detects the sony bravia's speakers and sometimes it does not! i clicked on add a device on hardware and sound in control panel! still it is not doing anything! plz help