Article ID: 238860 - Last Review: March 1, 2007 - Revision: 3.2

Uninterruptible Power Supply Goes into Battery Mode During Windows 2000 Installation

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This article was previously published under Q238860
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SYMPTOMS

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

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.
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RESOLUTION

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

Microsoft has confirmed that this is a problem in Microsoft Windows 2000.
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APPLIES TO
  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Professional Edition
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Keywords: 
kbhardware kbprb KB238860
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