No, you don't need VGA cables, those are video only and typically used with a computer, and an audio cable will definitely be needed. If this is being connected to a computer, your computer may not be able to send the digital audio down the Hdmi cable. If this is being used with a dvd or flu-ray, you may need to check the menu settings on both the tv and the player to see if audio is being delivered via hdmi. Also, not all Hdmi cables can carry audio channels, cheaper ones won't (dime store variety), but most should..
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