. . . "Replace the cable with another one to test if cable pins might be damaged.Use General Guidelines e.g. power cycle source or display or swop input to AV input on display and back to correct HDMI input.If using HDMI Distribution equipment with a Remote Control e.g. HDMI Switch / Splitter combo's or HDMI Switch only press the required input on the remote control to re-negotiate the HDCP handshake." .