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Also, if my laptop doesn't have HDMI or VGA, I can't connect it to my TV. Don't some ultrabooks only have Display Port out?

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Not just ultrabooks, while my XPS 13 obviously only has a mini-DP my big chunky W540 from work only has one as well (the dock has one, but chances are consumers aren't going to buy a $150 dock for their TV when a $20 mini-DP to HDMI cable will do just fine).

Yes, and even if something has DisplayPort and VGA (like some Thinkpads) you'd probably want to use DP where possible.

EDIT: and I'm fairly sure the suggestion for connecting a VGA laptop to a HDMI TV doesn't actually work that way around.

Indeed -- many TVs have VGA ports, or DVA, and that should be the first option if the computer only has VGA (or DVA) out.

You can buy a VGA to HDMI adaptor, but I haven't tried one.

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