Chromecast No Signal On Multiple TVs?

Ok so I was successfully able to set up my Chromecast by using the app on my iPhone, and it went from random lights (white to red to blinking white etc) to solid white, which I assume is good. The issue though is that there's no picture on the screen when plugged into the TV, and it has done this with other ones too. I'm SURE that I'm on the right HDMI input option on the TV, because when the Chromecast first boots up it says for a brief second on the bottom middle of the screen "Starting Chromecast" then it goes away and is just a black screen. Any help? I would rather not go through the pain to return it through Amazon and get another shipped. After calling Google yesterday and asking the support, they basically said it was defective without helping me for 5 minutes (I was on hold longer than getting helped) without saying what was wrong or why is wasn't working, which makes me think it could still possibly work though.

If Google says its defective then you really have no other choice than to return it to Amazon and exchange it.

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