Solving Power Supply Problems - Compaq Evo D300 Troubleshooting Manual

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.
2–6
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.
Troubleshooting Guide