When I plug an HDMI cable into my Macbook Pro, it just turns itself off. Help?

So I am trying to hook up my non-retina Macbook Pro to my HDTV to use it as a higher quality monitor, but one of two things always happens. When I try pluggingg in the HDMI, then turning on my Mac, it fails to detect the display. If I plug in the HDMI when the Mac is already on, my laptop will just turn itself off immediately. If anyone could tell me what I'm doing wrong, or if i need to get something else, it would be greatly apreciated.

I am wondering if you may have some debris in the output port where the plug is not allowed to be fully inserted.  If not, take to an Apple store genius bar for a free evaluation.
Ciao.

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