How to block HDMI output on graphic card?

Hi everyone

I Have AMD Radeon HD 7800 series installed on my PC. The Catalyst Control Center is also installed.
Due to some reasons I need to block the HDMI output of this graphic card. Is it possible ? if yes how?
 
Heh, what's your reasons? I don't know of any software solution, so you'll have to either not plug anything in or physically damage the HDMI port.
 
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