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Mirror desktops on Windows XP?

Asked by colin (574points) June 4th, 2008

After connecting my IBM Thinkpad to an external monitor, I cannot mirror the desktop. When I go into Control Panel->Display->Settings, the checkbox for “Use this device as the primary monitor” is grayed out. I think this is the option I need…I want to switch the primary monitor from the laptop monitor to the external monitor. Does anyone know why this would be grayed out?

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