Presentation settings are lost when the user attaches the computer to an external monitor
For a computer installed with the Microsoft Windows Vista Service Pack 2 (SP2) operating system, when the user turns on presentation settings through the following procedure, and then attaches the computer to an external monitor, all the presentation settings the user made will be lost.
The user can turn on presentation settings by doing the following:
Click Start, Control Panel or Start, Settings then Control Panel.
In the Control Panel Classic View, double-click the Windows Mobility Center icon. The Windows Mobility Center window opens, presenting a collection of menu options.
Locate the Presentation Settings section, and click the Presenting icon. The Presentation Settings window opens.