Compaq D51s Troubleshooting Guide - Page 20

Solving Power Supply Problems, Power LED flashes Red or

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Troubleshooting Without Diagnostics Solving Power Supply Problems Solving Power Supply Problems Problem Computer won't turn on (Power LED on front of computer not on). Power LED flashes Red or Yellow every 2 seconds on most models. Cause Computer is not connected to an external power source. Cables to the external power source are unplugged. Power switch not connected to the system board (supported on select models only). Power line selector switch on rear of computer chassis not switched to correct line voltage (115V or 230V) (some models). Wall outlet is defective. Power supply overloaded or short was detected. Diskette drive power cable not properly connected. Solution Connect to an external power source. Ensure that cables connecting the computer to the external power source are plugged in properly and the wall outlet is active. Plug the power switch cable into the system board. Select the proper AC voltage using the slide switch. Test the outlet by connecting a different electrical device to the outlet. Unplug computer from AC power. Unplug internal power cables from all devices and unplug all PCI cards. Reconnect devices one at a time and turn power on to identify the cause. When installing power cable to diskette drive, ensure that all 4 pins on the drive are connected to the power cable connector. 2-6 Troubleshooting Guide

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2–6
Troubleshooting Guide
Troubleshooting Without Diagnostics
Solving Power Supply Problems
Solving Power Supply Problems
Problem
Cause
Solution
Computer won’t turn on
(Power LED on front of
computer not on).
Computer is not
connected to an
external power source.
Connect to an external power
source.
Cables to the external
power source are
unplugged.
Ensure that cables connecting the
computer to the external power
source are plugged in properly
and the wall outlet is active.
Power switch not
connected to the
system board
(supported on select
models only).
Plug the power switch cable into
the system board.
Power line selector
switch on rear of
computer chassis not
switched to correct line
voltage (115V or 230V)
(some models).
Select the proper AC voltage using
the slide switch.
Wall outlet is defective.
Test the outlet by connecting a
different electrical device to the
outlet.
Power LED flashes Red or
Yellow every 2 seconds on
most models.
Power supply
overloaded or short
was detected.
Unplug computer from AC power.
Unplug internal power cables from
all devices and unplug all PCI
cards. Reconnect devices one at
a time and turn power on to identify
the cause.
Diskette drive power
cable not properly
connected.
When installing power cable to
diskette drive, ensure that all 4 pins
on the drive are connected to the
power cable connector.