HDCP is the form of content protection built into HDMI transmitters and receivers. Monitors/TVs should inform the source that they are only capable of displaying content and are not able to record it. It is my understanding that if the sink is other than a display unit, the signal is output in SD. But you have no signal at all.
I assume that you have selected the HDMI input to which you have connected your PC as the active input on your TV. If so, it would appear that the problem could be in the video card, cable or TV. If possible, try connecting another HDMI source or sink to attempt to locate the problem.