Hi guys. Please point me in the right direction if this is the wrong place to post. It's a basic question, and as I'm new to this home entertainment stuff, will like to seek for your input.

It's about the Full HD 1080p feature. Let's say I have a movie of that definition and I load it onto a USB stick and have a TV set, which supports Full HD 1080p, play it from the USB stick, will it be able to produce Full HD 1080p or just SD?

Is it a must for a HDMI cable be used, be it from a HD player or something else, in order for the TV set to produce the Full HD 1080p picture quality?

Thanking you guys in advance.