If it's not that fact you're using an incorrect input then it would have to be the cable or, somehow, the Dreamcast, though I can't imagine that being the case. I also assume there's nothing wrong with your A/V jack, since you said it's a new TV and you used your PS2 on it.
It's a pretty simple issue to figure out. If everything is connected correctly and you're on the right input it should just work. If it doesn't, try connecting it to a different TV or different input on your TV. If all else fails try getting a different cable for your Dreamcast. There's nothing I can think of that should stop it from working.
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