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Source: Microsoft Support
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Consider the following scenario:
You have a Windows XP portable computer that is connected to an external monitor.
You set the external monitor as the main monitor.
The external monitor has a screen resolution that differs from the portable computer's built-in monitor.
You put the portable computer into sleep or in hibernation.
You remove the external monitor.
In this scenario, when you wake the portable computer, the logon screen is not resized correctly. For example, the logon window may be smaller or larger than the screen on the portable computer.
This problem occurs because WinLogon.exe does not resize the screen in response to display resolution changes.
To work around this problem, perform any hardware changes, such as monitor attachment or removal before you put the system into Sleep or Hibernate mode.
Microsoft Windows XP Professional
Microsoft Windows XP Professional x64 Edition
Microsoft Windows XP Home Edition
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