Thanks for your comments and suggestions. Finally I discovered that my motherboard has integrated HDMI port. I changed my monitor to one which has hdmi support and now everything works fine. (It was time for change of monitor anyway).

Now I can log in to gnome, glxgears shows result of 60,000 FPS which is
like Ubuntu showed with nVidia graphic card with proprietary nVidia driver.

I removed that Nvidia graphic card (NVIDIA Corporation GF106 [GeForce GTS 450]) and plan to sell it.

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