Microsoft KB Archive/255002

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Uninterruptible Power Supply Goes into Battery Mode During Windows 2000 Installation


The information in this article applies to:

  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Datacenter Server
  • Microsoft Windows 2000 Professional
  • Microsoft Windows 2000 Server


When you install Windows 2000 on a computer that has an uninterruptible power supply (UPS) attached, the computer may go into Battery mode.


This behavior occurs during Setup when the serial enumeration driver (Serunum.sys) attempts to detect what exists on the serial ports. The UPS is started when the driver touches the serial port.


To work around this problem, disconnect the serial cable from the UPS during Setup. The problem does not occur after Setup is finished.


Microsoft has confirmed this to be a problem in Microsoft Windows 2000.

Additional query words:

Keywords : kbhw KBW2KHOME
Issue type : kbprb
Technology : kbwin2000AdvServ kbwin2000AdvServSearch kbwin2000DataServ kbwin2000DataServSearch kbwin2000Serv kbwin2000ServSearch kbwin2000Search kbwin2000ProSearch kbwin2000Pro kbWinAdvServSearch kbWinDataServSearch

Last Reviewed: October 24, 2000
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