Diagnostic Lights - Dell OptiPlex 170L Quick Reference Manual

Power Light
Blinking yellow
Solid green and a
beep code during
POST
Solid green power
light, no beep code
and no video during
POST
Solid green power
light and no beep
code but the
computer locks up
during POST

Diagnostic Lights

CAUTION:
located in the Product Information Guide.
To help you troubleshoot a problem, your computer has four lights labeled "A," "B," "C," and "D" on
the back panel. The lights can be yellow or green. When the computer starts normally, the patterns
or codes on the lights change as the boot process completes. If the POST portion of system boot
completes successfully, all four lights display solid green. If the computer malfunctions during the
POST process, the pattern displayed on the lights may help identify where in the process the
computer halted.
Light Problem Description
Pattern
The computer is in a normal off
off
condition or a possible pre-BIOS
off
failure has occurred.
off
off
20
Quick Reference Guide
Problem Description
A power supply or system board
failure has occurred.
A problem was detected while the
BIOS was executing.
The monitor or the graphics card may
be faulty or incorrectly installed.
An integrated system board device
may be faulty.
Before you begin any of the procedures in this section, follow the safety instructions
Suggested Resolution
Check "Diagnostic Lights" on page 20 to see
if the specific problem is identified. See
"Power Problems" in your online User's
Guide.
See "Beep Codes" on page 22 for instructions
on diagnosing the beep code. Also, check
"Diagnostic Lights" on page 20 to see if the
specific problem is identified.
Check "Diagnostic Lights" on page 20 to see
if the specific problem is identified.
Check "Diagnostic Lights" on page 20 to see
if the specific problem is identified. If the
problem is not identified, contact Dell for
technical assistance.
Suggested Resolution
• Verify that the computer is plugged into a working
electrical outlet and that you have pressed the power
button.