Setup Causes UPS to Switch to Battery Mode

 Last reviewed: January 25, 1996
Article ID: Q127083
The information in this article applies to:
  • Microsoft Windows 95

SYMPTOMS

When you install Windows 95 on a computer with an uninterruptible power supply (UPS) attached to a serial port, the UPS switches to battery mode during the hardware detection portion of Setup. If Setup does not finish before the battery in the UPS runs out, the UPS shuts down and the computer restarts.

CAUSE

The hardware detection portion of Setup attempts to detect the computer's serial ports. The method that Setup uses to query the serial ports can cause some serial-port-monitoring UPS models to believe that the external power has failed.

RESOLUTION

Disconnect the UPS monitoring cable from the serial port before you run Windows 95 Setup.

MORE INFORMATION

The following UPS models are known to exhibit the behavior described above:

  • American Power Conversion Smart-UPS series (all models)
  • American Power Conversion Matrix series (all models)

The products included here are manufactured by a vendor independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.

kbcategory: kb3rdparty kbsetup KBSubcategory: wpp95 win95

Additional reference words: 95 apc ups

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Last reviewed: January 25, 1996
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