GT-N7000 bad android , display black , But the sound is heard

I upgraded to Android 5.0 but she don`t work ,
I wanted to return back to 4.1.2 , and i installed 4.1 jelly bean for s2 .... i have note 1 .. help me...

Are Stalion cases any good? (great reviews but never heard of them...)

Has anyone tried the Stalion cases? This one has 4.8 out of 5 stars, which is almost suspiciously high for a brand I've never heard of and has never been mentioned here:

http://www.amazon.com/Galaxy-Case-Sh...ct_top?ie=UTF8

Thanks