Hi Zograf, you mean it used to run before you switched the montior?

Can you see if your desktop is set to 32-bit color? Check this under Start / Control Panel / Display / Settings tab / Color quality setting.

If that is set to 32-bit, can you try doing Start / Run / dxdiag.exe, go to the display tab and push the "Test Direct3D" button to see if DirectX is working properly on your machine?

Also, what type of video card do you have?

- Michael