HDMI Handshake failures.
Frankly, if you want a reliable video connection, HDMI isn't it. It has to due with a (bone headed?) feature to keep the link secure. And the way it seems to be done can result in the link staying down till the machines are restarted. As such, this is unreliable by design.
I just purchased a LED H6350 and been having issues with using my PC. I connect to my TV through HDMI and it defaults at 1080p@60hz. Picture looks great but every few minutes to sometimes hours, it will force a blackscreen for no reason. MY PC is still up and running but my tv is black. i really dont want to return it but seems like i have a defective unit. any suggestions?