3 Cannot Set Display Mode: Serious Sam

Ensure you have the latest DirectX version. Some users have found success by installing the legacy DirectX 9.0c runtime provided by the Official Microsoft Download Center . 2. Manually Edit the Configuration File

C:\Program Files (x86)\Steam\userdata\[YourUserID]\41070\local\ SeriousSam3.ini : Open this file with Notepad. Adjust Resolution serious sam 3 cannot set display mode

: Using a text editor like Notepad, players often find that toggling the fullscreen setting fixes the handshake issue. Changing gfx_bFullScreen = 1 Ensure you have the latest DirectX version