If none of these solutions work, consider reaching out to Croteam's support or visiting the game's forums on platforms like Steam or official community sites. There might be specific patches or community fixes available.
Serious Sam 3: "Cannot set display mode" Error on Launch serious sam 3 cannot set display mode
The game engine (Serious Engine 3.5) fails to initialize a compatible DirectX or OpenGL display mode due to: If none of these solutions work, consider reaching