Hello friends.
So, back up is done. Everything is up and running perfectly. And the big news is...
There is no more hissing sound on the videos. Also no buzz or any noise under full load (I downloaded 3D Mark)
Im pretty much a happy camper right now

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And just for fun...
I signed up for the IOS 10.2 Beta 7 and running it right now. So far so good. Seemed quite stable.
Cheers!