The "Cannot Set Display Mode" error is almost always caused by the game trying to load an outdated resolution. By either using the Steam pre-launch configuration tool or manually editing the PersistentSymbols.ini file to match your monitor's native resolution, you can bypass the error and play the game normally.
If you are playing the classic versions via Steam, the platform provides a pre-launch configuration tool that bypasses the in-game settings bug. cannot set display mode serious sam
The classic versions often fail because they default to resolutions no longer supported by modern displays (like 640x480). The "Cannot Set Display Mode" error is almost