Dell OptiPlex 390 Owner's Manual

Also see for OptiPlex 390: Setup & features Quick reference guide Specifications Specifications Setup & features

Contents

Troubleshooting 20Diagnostic LEDsNOTE: The diagnostic LEDs only serve as an indicator of the progress through thePower-on Self-Test (POST) process. These LEDs do not indicate the problem thatcaused the POST routine to stop.The diagnostic LEDs are located on the front of the chassis next to the powerbutton. These diagnostic LEDs are only active and visible during the POSTprocess. Once the operating system starts to load, they turn off and are nolonger visible.The system now includes pre-POST and POST LEDs in an attempt to helpidentifying a possible problem with the system easier and more accurate.NOTE: The diagnostic lights will blink when the power button is amber or off, andwill not blink when it is blue. This has no other significance.Diagnostic Light PatternsLEDPower ButtonProblemDescriptionThe computer is either turned off or is not receivingpower.TroubleshootingSteps • Re-seat the power cable in the power connector atthe back of the computer and the electrical outlet.• Bypass power strips, power extension cables, andother power protection devices to verify that thecomputer turns on properly.• Ensure that any power strips being used are pluggedinto an electrical outlet and are turned on.• Ensure that the electrical outlet is working by testingit with another device, such as a lamp.67