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Is there a link between HDMI and USB ports on Flatpanels

Morning all. Is there a link between the HDMI ports and the USB ports on the flatpanels v 4 and 5? A teacher was connecting up a laptop belonging to a visitor to the school but the sound wouldn't work through the HDMI port until she connected up the USB port. Then it worked fine. I thought the USB was for only the touch but as the visitor only needed to play a video she thought she only needed to connect the HDMI cable. My understanding of HDMI is it handles both audio and video. Any ideas?

Thanks

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