ME Legendary: ME2 + ME3 Blackscreen

Dear all, 

after having much fun with ME1 in HD again, i am facing the Blackscreen in ME2 and 3 which makes it impossible to play. 

Just after selectin ME2 or ME3 to play in the Launcher, i can briefly see the 'team to be' picture, then my TV turns black and i can still hear the launcher, but can't see jack.

GPU driver update, switching between full/windowed view, reinstallation doesn't change anything. 

What i have noticed is:

- after restarting, my grafic settings are in HDR mode suddenly, which i don't use and the taskbar is 2 lines thick instead of one. Both is repeatable any time.

- yesterday i could play ME3 without issues for roughly 2 hours, but after i went into options (where i didn't change anything, just had a look) the blackscreen was back.. in both games

Of course i did a lot of googling and found out, that the blackscreen problem is an issue already happened in the old days, with the original game. I cannot understand how that can be still there.

Please, get it solved or let me know of a workaround.

Thanks,