Dell Precision 490 Desktop: Light Pattern Problem Description Suggested Resolution

Light Pattern Problem Description Suggested Resolution

A possible USB failure

Reinstall all USB devices, check cable connections,

has occurred.

and then restart the computer.

No memory modules

1

Reseat the memory modules to ensure that your computer

are detected.

is successfully communicating with the memory.

2

Restart the computer.

3

If the problem still exists, remove all the memory modules

and install one memory module in memory module

connector DIMM_1.

4

Restart the computer.

A message appears stating that because your memory

is not paired, the system will operate with reduced

performance and reduced error-correction capability

5

Press <F1> to boot to the operating system.

6

Run the Dell Diagnostics. See your

User’s Guide

for more

information.

7

If the memory module passes, shut down the computer,

remove the memory module, and then repeat the process

with the remaining memory modules until a memory error

occurs during start-up or diagnostic testing.

If the first memory module tested is defective, repeat the

process with the remaining modules to ensure that the

remaining modules are not defective.

8

When the defective memory module is identified, contact

Dell for a replacement

.

No memory modules

• If you have one memory module installed, reinstall it

are detected.

and restart the computer.

• If you have two or more memory modules installed,

remove the modules, reinstall one module, and then

restart the computer). If the computer starts normally,

reinstall an additional module. Continue until you have

identified a faulty module or reinstalled all modules

without error.

• If available, install properly working memory of the same

type into your computer.

• If the problem persists, contact Dell.

System board failure

Contact Dell

for technical assistance

.

has occurred.

Quick Reference Guide 41