Open the cover and place a fan on top of the HDMI board. most likely this will be the cause since most issues with onkyo are related to heating.
this should do it.or try to reset the HDMI Board, HOLD BD/DVD button and press power bottom it will give you an option to disabe the HDMI card. it that does not work contact me I can give you the steps to run the ONKYO diagnostics it's conbination of keys that will give you about 50 diferents tests to perform.
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