HDMI CORD WON'T FIT INTO TV?

Update: I have an hisense h8c tv and I can't get my rocketfish 8foot hdmi cable to plug into the TV slots is their something wrong with the TV am I doing something weird? the cord fits in other items like my ROKU premiere box and PS3 with a firm fit
Update 2: Yes I am using an HDMI cord Yes I am trying to put it in the correct hole. I currently have a 4 foot HDMI cable in the tv but the new one just isn't working. would this be a cord defect or a TV defect?
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