Compaq Evo D300 Troubleshooting Manual page 18

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.
2–4
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.
Troubleshooting Guide