Which one is set to your primary monitor?

>Hi everybody,
>
>I added a second monitor which is Acer X203H and resolution set to 1600*900 while laptop monitor set as the main monitor and its resolution is 1920*1080.
>
>The problem is that after I close the laptop for the night, when I open it, the screen displays only on the second monitor, the image is distorted and also it doesn't show the login screen. So, at that point my only option is to re-boot. Also, it takes quite a while for the Windows blue screen after login to become my usual screen.
>
>So, I am wondering what may be going on and what should I do to fix this problem.
>
>Thanks in advance.
>
>Also, there was a Windows Update for the video card recently.