I tried contacting their support but they are useless. I have the AT3720A and I have experienced the HDMI HANDSHAKE. Basically its not accepting any HDMI devices, there is no option in settings to reset the hdmi. I know the HDMI is still functioning as I am able to get it to display if I connect a USB TO HDMI adapter from my laptop to the tv, if I use the built in HDMI in my laptop that used to work, nothing happens. Ideas?
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