Press and hold the power supply test button on the back of the power supply unit.
Power off computer, leaving the computer plugged in. NOTE: After the computer completes POST, all four lights turn off before booting to the operating system.Ī possible motherboard, power supply, or peripheral failure has occurred. If the computer malfunctions, use the sequence of the lights to help identify the problem. 
When the computer starts normally, the lights flash, and then turn off. See the Setup and Quick Reference Guide that ships with your computer for more information. NOTE: If you are using an ultra form factor computer, the diagnostic lights are present on the back panel. To help troubleshoot a problem, your computer has four lights labeled 1, 2, 3, and 4 on the front panel.
Multiple power strips connected to the same electrical outlet. Power, keyboard, and mouse extension cables. Some possible causes of interference are: Remove and then reinstall the memory modules (see Memory). If the power light is steady amber, a device may be malfunctioning or incorrectly installed. Ensure that the processor power cable is securely connected to the system board. Ensure that the voltage selection switch is set to match the AC power at your location, if applicable. If the power light is blinking amber, the computer is receiving electrical power, but an internal power problem may exist. Ultra Small Form Factor System Board Components. Small Form Factor System Board Components. Ensure that the main power cable and front panel cable are securely connected to the system board. Ensure that the electrical outlet is working by testing it with another device, such as a lamp. Bypass power protection devices, power strips, and power extension cables to verify that the computer turns on properly. 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. Reseat the power cable into both the power connector on the back of the computer and the electrical outlet. If the power light is off, the computer is either turned off or is not receiving power. Press a key on the keyboard, move the mouse, or press the power button to resume normal operation. If the power light is blinking green, the computer is in standby mode. If the power light is green and the computer is not responding, see Diagnostic Lights. 
The power button light located on the front of the computer illuminates and blinks or remains solid to indicate different states: WARNING: Always unplug your computer from the electrical outlet before See the Regulatory Compliance Homepage on at For additional safety best practices information, WARNING: Before working inside your computer, read the safety information Troubleshooting: Dell OptiPlex 760 Service Manual
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