hi, i really need help on this one. I installed "ECHO" hours ago and when i launched it all was ok. but i changed the resolution and erverything stopped working. I can still hear the menu but i'm on a black screen. I tried for the fifth time to uninstall the game and reinstall it but nothing worked. still the same problem, black screen but with sound. If someone have a solution, i will try it ^^'

You probably should take this up with support:

support.gog.com

There's way too many variables at play here (outdated drivers, corrupted installation, not meeting the min requirements and whatnot) to track down the culprit responsible for your problem.