Diagnostic Lights - Dell optiplex 755 Quick Reference Manual

Power Light
Solid green and a
beep code during
POST
Solid green
power light and
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:
safety instructions in the Product Information Guide.
To help troubleshoot a problem, your computer has four lights labeled 1, 2, 3,
and 4 on the front panel. When the computer starts normally, the lights flash
before turning off. If the computer malfunctions, the sequence of the lights
help to identify the problem.
NOTE:
After the computer completes POST, all four lights turn off before booting to
the operating system.
66
Quick Reference Guide
Problem Description
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
Suggested Resolution
See "Beep Codes" on page 70 for
instructions on diagnosing the
beep code. Also, check the
diagnostic lights to see if the
specific problem is identified
(see "Diagnostic Lights" on
page 66).
Check the diagnostic lights to
see if the specific problem is
identified (see "Diagnostic
Lights" on page 66).
See "Video and Monitor
Problems" in the User's Guide.
Check the diagnostic lights to
see if the specific problem is
identified (see "Diagnostic
Lights" on page 66). If the
problem is not identified,
contact Dell for technical
assistance (see "Contacting
Dell" in the User's Guide).