Dell Dimension XPS T___ User Manual

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System Codes and Messages:

Dell™ Dimension™ XPS Txxx and Txxxr Systems

Reference

•

Diagnostic Codes

Your system is equipped with four diagnostic code indicators, which are labeled "A," "B," "C," and "D" on the back of the computer. Each of the
four indicators can be yellow, green, or off as shown in

Table 1

. When the computer is turned on or restarted and the system is functioning normally,

the indicators flash during power-on self-test (POST). After the system starts, the indicators remain green to signify normal system operation.

If a malfunction is detected and the computer fails to start, the indicators display a code that identifies the problem. Write down the diagnostic code
displayed, and look it up in Table 1.

Table 1. Diagnostic Codes

Diagnostic Code

Definition

Corrective Action

Power up default.

Make sure that the system is
connected to an electrical outlet, and
then check whether the front-panel
power indicator (see

Controls and

Indicators

) is on or off. If the power

indicator is off, check the

power

supply

. If the problem persists, refer

to Chapter 7, "Getting Help," of the
Dell Dimension XPS Txxx and
Txxxr Systems Reference and
Troubleshooting Guide for
instructions on obtaining technical
assistance.

If the power indicator is on,

reseat the

microprocessor

Remove all

expansion cards

. If the system still

does not start, refer to Chapter 7,
"Getting Help," of the Reference and
Troubleshooting Guide for
instructions on obtaining technical
assistance.

System board is receiving power,
but the BIOS is not executing.

Set the

configuration jumper

Maintenance mode and restart the
system. Enter the

system setup

program

and ensure that the

microprocessor speed is set
correctly. Exit and save the setting.
Turn off the computer and reset the
configuration jumper to Normal mode,
and then restart the system.

Reseat

the microprocessor

Remove all

expansion cards

and restart the

system to determine if a resource
conflict exists. If a conflict exists,
resolve the conflict as described in
"Resolving Software and Hardware
Incompatibilities" in Chapter 5 of the
Reference and Troubleshooting
Guide. If the problem persists, refer
to Chapter 7, "Getting Help," of the
Reference and Troubleshooting
Guide for instructions on obtaining
technical assistance.

Recovery mode from BIOS failure.