Compaq D51s Troubleshooting Guide - Page 18

Continued, Control Panel, Computer Setup, Problem, Cause, Solution - cooling fan replacement

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Troubleshooting Without Diagnostics Solving General Problems (Continued) Problem Computer date and time display is incorrect. Computer powered off automatically and the Power LED is: 1. Flashing Red or Yellow four times per second, OR 2. Flashing Red or Yellow two times one second apart, followed by a two second pause, OR 3. Not flashing. Cause RTC (real-time clock) battery may need to be replaced. Battery life is approximately 3-5 years. The unit temperature was exceeded. A fan may be blocked or not turning. OR the heatsink is not properly attached to the processor. The unit temperature was exceeded because the computer was functioning with the cover or access panel removed. Air Baffle (if required) is not installed properly to redirect air flow over processor. Processor or system fan has failed. Solution First, reset the date and time under Control Panel (Computer Setup can also be used to update the RTC date and time). If the problem persists, replace the RTC battery. See the Hardware Reference Guide for instructions on installing a new battery, or contact your Compaq authorized dealer or reseller for RTC battery replacement. 1. Unit is in an exceedingly hot environment. Let it cool down. 2. Ensure computer air vents are not blocked and internal fans are running (such as the power supply fan, chassis fan, and/or the processor fan). 3. Ensure heatsink is properly seated. 4. Contact Compaq authorized reseller or service provider. Replace cover or access panel, and let the computer cool down before attempting to turn on power to the computer. Reseat Air Baffle per instructions in the Hardware Reference Guide. Contact a Compaq authorized service provider to replace the processor or system fan. 2-4 Troubleshooting Guide

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2–4
Troubleshooting Guide
Troubleshooting Without Diagnostics
Computer date and
time display is
incorrect.
RTC (real-time clock)
battery may need to be
replaced. Battery life is
approximately 3–5 years.
First, reset the date and time under
Control Panel
(
Computer Setup
can also be used to update the
RTC date and time). If the problem
persists, replace the RTC battery.
See the
Hardware Reference Guide
for instructions on installing a new
battery, or contact your Compaq
authorized dealer or reseller for RTC
battery replacement.
Computer powered off
automatically and the
Power LED is:
1. Flashing Red or
Yellow four times
per second, OR
2. Flashing Red or
Yellow two times
one second apart,
followed by a two
second pause, OR
3. Not flashing.
The unit temperature was
exceeded. A fan may be
blocked or not turning.
OR the heatsink is not
properly attached to the
processor.
1. Unit is in an exceedingly hot
environment. Let it cool down.
2. Ensure computer air vents are
not blocked and internal fans are
running (such as the power
supply fan, chassis fan, and/or
the processor fan).
3. Ensure heatsink is properly
seated.
4. Contact Compaq authorized
reseller or service provider.
The unit temperature was
exceeded because the
computer was functioning
with the cover or access
panel removed.
Replace cover or access panel, and
let the computer cool down before
attempting to turn on power to the
computer.
Air Baffle (if required) is
not installed properly to
redirect air flow over
processor.
Reseat Air Baffle per instructions in
the
Hardware Reference Guide.
Processor or system fan
has failed.
Contact a Compaq authorized
service provider to replace the
processor or system fan.
Solving General Problems
(Continued)
Problem
Cause
Solution