To learn how to set up multiple monitors in Windows 10, go to How to use multiple monitors in Windows 10.
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Introduction
In Windows 7, it is easy to add a second monitor by using the new hotkey Win+P. This is convenient when you need to change the display settings during your presentations with a projector connected to your laptop.
Here are two methods to set up multiple monitors in Windows 7. Make sure that you connect the external monitors to your laptop or your desktop computer first.
Method 1: By keyboard shortcut 'Win+P'
Press the Windows logo key + P on your keyboard. Select one of the following options according to your needs: (The screen shot for this step is listed below.)
Method 2: By the 'Screen Resolution' menu
1. Right-click any empty area of your desktop, and then click Screen resolution. (The screen shot for this step is listed below.)
2. Click the Multiple displays drop-down list, and then select Extend these displays, or Duplicate these displays. Note If you cannot see the additional monitor(s) listed, click Detect. If does not work, try restarting your computer and do step 1 to 2 again. (The screen shot for this step is listed below.)
For more information, click the following Microsoft links:
973782 Error message when you configure the display settings to try to use three or more displays on a laptop that is running Windows 7: 'Unable to save display settings'
1. Right-click any empty area of your desktop, and then click Screen resolution. (The screen shot for this step is listed below.)
2. Click the Multiple displays drop-down list, and then select Extend these displays, or Duplicate these displays. Note If you cannot see the additional monitor(s) listed, click Detect. If does not work, try restarting your computer and do step 1 to 2 again. (The screen shot for this step is listed below.)
For more information, click the following Microsoft links:
973782 Error message when you configure the display settings to try to use three or more displays on a laptop that is running Windows 7: 'Unable to save display settings'
Symptoms
Consider the following scenario:
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You are using multiple monitors in Microsoft Windows 7.
You change the monitor that is used as the primary monitor.
You log off the computer.
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After you log back on to the computer, one or more of the following symptoms occur:
The taskbar appears on the wrong monitor. For example, the taskbar appears on the secondary monitor and the desktop icons appear on the primary monitor.
When you start a program, the program window does not start on the same monitor as the taskbar.
Dialog boxes do not appear on the same monitor as the taskbar.
Desktop icons are spread across both montitors.
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These symptoms occur if you are using a video adaptor to which you can connect two monitors (for example, you are using a single video adaptor that has two VGA connections so that you can run two monitors at the same time), and you follow these steps:
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In the Screen Resolution window, you click the monitor icon that represents the secondary monitor.
You click to select the 'Make this my main display' check box, and then click OK.
You log off the computer.
You log back on to the computer.
