Hdmi has no video

Recently after working perfect, my HDMI output of my Mac Mini has quit working. I can use the thunderbolt and works fine but trying to figure out why the HDMI quit working.

If after resetting NVRAM and SMC there is no HDMI video during boot before the OS is even loaded that points to a hardware problem.
- Make an appointment at the Genius Bar of an Apple store.
Apple Retail Store - Genius Bar

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Hi,
I just went to the store to get a HDMI-DVI and mini (from my macbook) to DVI to watch my MB on my tv. I only see the desktop background without the icons or any window I have open. What am I doing wrong? Please help Are there any specials steps to see the whole enchilada?
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Hdmi has no video

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