Dell OPTIPLEX 990 Service Manual download pdf (Page 70)

• If the LED still does not illuminate, the problem is with

the power supply.

LED

Power Button

Problem

Description

Memory modules are detected, but a memory power failure has

occurred.

Troubleshooting

Steps

• If two or more memory modules are installed, remove

the modules, then re-install one module and re-start

the computer. If the computer starts normally, continue

to install additional memory modules (one at a time)

until you have identified a faulty module or reinstalled

all modules without error. If only one memory module is

installed, try moving it to a different DIMM connector

and re-start the computer.

• If available, install verified working memory of the

same type into your computer.

LED

Power Button

Problem Description BIOS may be corrupt or missing.

Troubleshooting Steps The computer hardware is operating normally but the BIOS

may be corrupt or missing.

LED

Power Button

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Dell OPTIPLEX 990 Service Manual Page 70