Advanced troubleshooting, Power lights, Diagnostic lights – Dell Dimension 4700 User Manual
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Advanced Troubleshooting
Dell Dimension 4700 Series Service Manual
Power Lights
The power button light located on the front of your computer illuminates and blinks or remains solid to indicate different states:
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If the power light is green, the power status is good and the computer is functioning properly.
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If the power light is green and the computer is not responding, see "
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If the power light is blinking green, the computer is in standby mode. Press a key on the keyboard or move the mouse to resume normal operation.
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If the power light is off, the computer is either turned off or is not receiving power.
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Reseat the power cable into both the power connector on the back of the computer and the electrical outlet.
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If the computer is plugged into a power strip, ensure that the power strip is plugged into an electrical outlet and that the power strip is turned
on. Also bypass power protection devices, power strips, and power extension cables to verify that the computer turns on properly.
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Ensure that the electrical outlet is working by testing it with another device, such as a lamp.
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Ensure that the main power cable and front panel cable are securely connected to the
system board
.
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If the power light is blinking amber, the computer is receiving electrical power, but an internal power problem might exist.
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Ensure that the voltage selection switch is set to match the AC power at your location (if applicable). See your Owners Manual for more
information.
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Ensure that the processor power cable is securely connected to the system board. See your Owners Manual for more information.
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If the power light is steady amber, a device might be malfunctioning or incorrectly installed.
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Remove and then reinstall the memory modules
.
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Remove and then reinstall any cards
.
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Remove and then reinstall the
graphics card
, if applicable.
Diagnostic Lights
To help you troubleshoot a problem, your computer has four lights labeled "A," "B," "C," and "D" on the back panel (see your Owner's Manual). The lights can
be yellow or green. 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.
CAUTION:
Before you begin any of the procedures in this section, follow the safety instructions located in your Product Information Guide.
Light Pattern
Problem Description
Suggested Resolution
The computer is in a normal off
condition or a possible pre-BIOS
failure has occurred.
Plug the computer into a working electrical outlet and press the power button.
Memory modules are detected, but
a memory failure has occurred.
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If you have one
memory
module installed, reinstall it and restart the computer.
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If you have two or more
memory
modules installed, remove the modules, reinstall one module,
and then restart the computer. If the computer starts normally, reinstall an additional module.
Continue until you have identified a faulty module or reinstalled all modules without error.
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If available, install properly working
memory
of the same type into your computer.
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If the problem persists, contact Dell (see your Owner's Manual).
A possible graphics card failure has
occurred.
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If the computer has a
graphics card
, remove the card, reinstall it, and then restart the
computer.
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If the problem still exists, install a graphics card that you know works and restart the
computer.
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If the problem persists or the computer has integrated graphics, contact Dell (see your
Owner's Manual).