Dell OptiPlex 160 (Late 2008) - Manual (Page 43)

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Troubleshooting
Dell™ OptiPlex™ FX160/160 Service Manual
Tools
Dell Diagnostics
Solving Problems
Dell Technical Update Service
Tools
Power Lights
The power button light located on the front of the computer illuminates and blinks or remains solid to indicate different states:
l If the power light is blue and the computer is not responding, see Diagnostic Lights .
l If the power light is blinking blue, the computer is in standby mode. Press a key on the keyboard, move the mouse, or press the power button to
resume normal operation.
l If the power light is off, the computer is either turned off or is not receiving power.
¡ Reseat the power cable into both the power connector on the back of the computer and the electrical outlet.
¡ 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.
¡ Bypass power protection devices, power strips, and power extension cables to verify that the computer turns on properly.
¡ Ensure that the electrical outlet is working by testing it with another device, such as a lamp.
¡ Ensure that the 12V power cable and front panel cable are securely connected to the system board (see System Board Connectors ).
l If the power light is steady amber, a device may be malfunctioning or incorrectly installed.
¡ Remove and then reinstall the memory modules (see Memory ).
¡ Remove and then reinstall the NVRAM module, if installed (see NVRAM Module ).
¡ Remove and then reinstall the wireless card, if installed (see Wireless Card ).
l Eliminate interference. Some possible causes of interference are:
¡ Power, keyboard, and mouse extension cables
¡ Too many devices on a power strip
¡ Multiple power strips connected to the same electrical outlet
Diagnostic Lights
To help troubleshoot a problem, your computer has four diagnostic lights labeled 1, 2, 3, and 4 on the front panel. When the computer starts normally, the
lights flash, and then turn off. If the computer malfunctions, use the sequence of the lights to help identify the problem.
Diagnostic Light Codes During POST
WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best
practices information, see the Regulatory Compliance Homepage at www.dell.com/regulatory_compliance.
WARNING: Always unplug your computer from the electrical outlet before opening the computer cover.
WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best
practices information, see the Regulatory Compliance Homepage at www.dell.com/regulatory_compliance.
NOTE: After the computer completes POST, all four lights turn off before booting to the operating system.
Light Pattern Problem Description Suggested Resolution
The computer is in a normal off
condition or a possible pre-
BIOS failure has occurred. l Plug the computer into a working electrical outlet and press the power button (see Power
Problems ).
l If the problem persists, contact Dell (see Contacting Dell ).