42 inch LED/LCD/Plasma

Hi Guys
The TV got installed and i watched Avatar Blu-Ray Rip and the PQ was awesome.
It was a full screen Rip.
In order to prevent Burn in i am watching all the movies in full screen.
Zooming some of the movies.
I have left contrast at 30 and brightness is zero
Should i do anything else to prevent burn-in?

Also i want to know what formats are playable through USB
Will it play .mkv files?
Also the audio is dolby digital?
Is it 2.1 or 5.1?

Thanks
 
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