Compaq D51s Troubleshooting Guide - Page 44

Solving Memory Problems, Getting, Started - usb problem

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Troubleshooting Without Diagnostics Solving Memory Problems If you encounter memory problems, some common causes and solutions are listed in the following table. Ä CAUTION: Some models support ECC memory and non-ECC memory. Other models support only non-ECC memory. For those systems that do support ECC memory, Compaq does not support mixing ECC and non-ECC memory. Doing so will cause the system to blink the Num Lock LED on non-USB keyboards continuously and, if a speaker is installed in the system, there will be a short beep followed by 2 long beeps. In addition, the system will not boot the operating system. ✎ See the "Interpreting the Diagnostic Lights" section of the Getting Started guide to identify other possible memory problems. Solving Memory Problems Problem System won't boot or does not function properly after installing additional memory modules. Cause Memory module is not the correct type or speed grade for the system or the new memory module is not seated properly. On a single-channel Rambus memory system, the RIMM sockets may be empty. On dual-channel Rambus memory system, RIMM pairs may not be identical. Solution Replace module with the correct industry-standard device for your computer. On some models, ECC and non-ECC memory modules cannot be mixed. Check to see that all RIMM sockets contain either RIMMs or CRIMMs and replace them if needed. RIMMs must be added in pairs that are identical in speed, number of devices, and manufacturer. If the RIMM pairs are not identical, replace them. 2-30 Troubleshooting Guide

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2–30
Troubleshooting Guide
Troubleshooting Without Diagnostics
Solving Memory Problems
If you encounter memory problems, some common causes and
solutions are listed in the following table.
Ä
CAUTION:
Some models support ECC memory and non-ECC memory.
Other models support only non-ECC memory. For those systems
that do support ECC memory, Compaq does not support mixing ECC
and non-ECC memory. Doing so will cause the system to blink the
Num Lock
LED on non-USB keyboards continuously and, if a speaker
is installed in the system, there will be a short beep followed by 2 long
beeps. In addition, the system will not boot the operating system.
✎
See the “Interpreting the Diagnostic Lights” section of the
Getting
Started
guide to identify other possible memory problems.
Solving Memory Problems
Problem
Cause
Solution
System won’t boot or does
not function properly after
installing additional
memory modules.
Memory module is not
the correct type or
speed grade for the
system or the new
memory module is
not seated properly.
Replace module with the correct
industry-standard device for your
computer.
On some models, ECC and
non-ECC memory modules cannot
be mixed.
On a single-channel
Rambus memory
system, the RIMM
sockets may be empty.
Check to see that all RIMM sockets
contain either RIMMs or CRIMMs
and replace them if needed.
On dual-channel
Rambus memory
system, RIMM pairs
may not be identical.
RIMMs must be added in pairs that
are identical in speed, number of
devices, and manufacturer. If the
RIMM pairs are not identical,
replace them.