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So... I foud the solution.
Firstly, based on thу fact that flickering was on both win 7 & win 10.... that push me thinking in the direction of hardware problem.
So... notebook was disassembled, complitly.... up to change the thermo paste on CPU & Chipset.
Everything was blow with compressor... clean with alcohol (he-he!)
And assembled back....
And - WONDER!!!!!!!!!! Problem's gone!
thanks a lot for your support.