Thanks! What I did today was;
From here, I downloaded the latest beta version.
Now, I rebooted. The first screen started showing me all the booting logs.
Before launching the login screen. I got the other screen active. The first screen just showed .. launching display manager.
And the other screen showed the login screen. I logged in and was able to use only second screen. When I pressed alt+f2 ; I was able to switch to first screen but this just showed me..launching display manager. I couldn't do anything.
My desire is to use dual monitor setup. Thus, I will be able to move my workspace items to another window.
Afterwards, I installed NVidia-config. This is also not helping me.