Diagnostic lights – Dell Precision 670 User Manual
Page 132
Tools to Help Solve Problems: Dell Precision Workstation 470 and 670 Computers User's Guide
file:///T|/htdocs/systems/ws670/EN/ug_en/advtrbl.htm[3/20/2013 9:31:57 AM]
Solid green and a beep
code during POST
N/A
A problem was detected while the
BIOS was executing.
See "
" for instructions on diagnosing
the beep code. Also, check the diagnostic lights
to see if the specific problem is identified.
Solid green power light and
no beep code and no video
during POST
N/A
The monitor or the graphics card
may be faulty or incorrectly installed.
Check the diagnostic lights to see if the specific
problem is identified. See "
Solid green power light and
no beep code but the
computer locks up during
POST
N/A
An integrated system board device
may be faulty.
Check the diagnostic lights to see if the specific
problem is identified. If the problem is not
for technical assistance.
Diagnostic Lights
CAUTION:
Before you begin any of the procedures in this section, follow the safety instructions 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 front panel. The lights
can be yellow, green, or off. When the computer starts normally, the lights flash. After the computer starts, all four lights
display solid green. If the computer malfunctions, the color and sequence of the lights identify the problem.
Diagnostic Light Codes Before POST
Light Pattern
Problem Description
Suggested Resolution
off
off
off
off
No electrical power is
supplied to the computer.
Connect the computer to an electrical outlet. Ensure that the front-
panel power light is on. If the power light is off, ensure that the
computer is connected to a working electrical outlet and then press
the power button.
If the problem is still not resolved,
assistance.
yellow
off
off
off
The computer is in a
normal off condition; the
computer is connected to
an electrical outlet.
Press the power button to turn the computer on.
If the computer does not turn on, ensure that the front-panel
power light is on. If the power light is off, ensure that the computer
is connected to a working electrical outlet and then press the power
button.
If the problem is still not resolved,
assistance.
yellow
yellow
off
off
The computer is in a
reduced power or "sleep"
state.
Use one of the appropriate methods to "wake up" the computer.
See "
."
If the problem is not resolved and you are trying to wake the
computer with a USB mouse or keyboard, substitute the mouse or
keyboard with a working PS/2 mouse or keyboard and then try to
wake the computer.
yellow
yellow
yellow
off
The BIOS is not executing.
Ensure that the processor is seated correctly and restart the
computer.
If the problem is still not resolved,
assistance.
off
yellow
off
off
A possible power supply or
power cable failure has
occurred.
Perform the procedure in "
If the problem is still not resolved,
assistance.