Hi! I purchased my ATV in Miami, but I live in Argentina. I have not been able to get the device running on any TVs. When I plug it in, it briefly shows the apple logo, then a sign saying no signal, check power cords and power source or sthg like that.

Hi!
I purchased my AppleTV in Miami, but I live in Argentina.
I have not been able to get my device running correctly, and altough I've read tons of things online, I still have no solution to my problem.
Here's the thing: after everything's plugged in and ON, I see the Apple logo briefly, then the TV displays a sign that says no signal, check pwoer cords and power source.
But everything is plugged in and connected properly, otherwise, I doubt I'd be seeing the apple logo, right?
I tried changing the HDMI cable, reversing the ends, switching ports, hard resetting the ATV, and trying a different TV. No luck.
I read there is some issue with Samsung TVs, and most LED and LCD tvs down here are Samsung.
On the other hand, I cannot return it or exchange it, since I bought it in the states.
Oh! One of the tvs I tried it on displays a little sign that reads "connected at 1280x720 @60hz", and only THEN, goes to the "no signal" sign.
Please!!! I am being driven up the walls here.... HELP!!

Try this:
Change the Apple TV resolution:
Press and hold the Menu and Up button on your Apple Remote for six seconds.
The Apple TV will automatically cycle to the next resolution at approximately 20 second intervals.
Press Play on the Apple Remote to keep the current resolution or Select to manually cycle to the next resolution.

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