poliane,

To get rid of the border on the monitors you can follow the steps below.

Open  Control Panel / Catalyst Control Center.

At the  top/left  of the dialog, click the  Graphics  drop down menu.

Select  Desktop and Displays.

At the bottom of that window, click the  Black Arrow  at the top of the Monitor Image and select  Configure.

In the Image  Scaling  section, select the  Scale image to full panel size  option.

Click  Apply/OK.