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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.
177620-006.book Page 30 Thursday, March 14, 2002 3:16 PM