![]() ![]() Reconnect one at a time and check if the computer functions. If the computer is not beeping and the Diagnostic LEDs are not flashing or lit? Unplug all connections and remove all media communication devices (for example external monitors).If you cannot find the beep or LED diagnostics code your personal computer displays in any of the media above, contact Dell Technical support directly.For information about Desktop LED codes, see the table in your computers User Manual or check out these articles:ĭiagnostic Indicators (Inspiron Desktops),ĭiagnostic Indicators (OptiPlex Desktops),ĭiagnostic Indicators (Dell Precision Workstations.).Understanding Beep Codes on a Dell Desktop or All-in-One PC For information about computer beep codes, see the table in your computers User Manual or have a look at this article:.Remove all attached components, reattach the PSU cables and using the PSU test button, install each component individually to test. If after removing the cables from the system board and the PSU LED illuminates, one of the attached devices or components could be faulty.If the LED still does not illuminate when the test button is pressed, the PSU is possibly faulty. If the PSU LED does not illuminate, remove the PSU cables from the system board and test again.Ensure that the power cable is connected to the supply and press the test button to test the PSU. A test button and LED are on the side of the unit where the AC plug is located. All power supply units include a self-test ability in an isolation mode.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.Ensure that any power strips being used are plugged into an electrical outlet and are turned on.Bypass power strips, power extension cables, and other power protection devices to verify that the computer turns on properly.Reseat the power cable in the power connector on the back of the computer and the electrical outlet.Try these quick steps to recover your Dell computer from a power issue.The computer is either turned off or not receiving power. The display is blank or black, the computer does not start, and there is no indication of turn on the computer.Power LED is off and does not respond when you try to turn on the computer.There is no indication of the computer turning on (all the LEDs are off). When you press the power button, the Dell computer does not turn on. Identify the symptoms and troubleshoot No Power To learn more, see the Dell knowledge base article How to run the Online Diagnostics and use the Diagnostics for Troubleshooting. If the Dell computer can boot into Windows and has an active Internet connection, run the online diagnostic test from SupportAssist.To learn more, see the Dell knowledge base article How to Run a Preboot Diagnostic Test on a Dell Computer. If the Dell computer cannot boot into Windows, run the preboot diagnostic test.This helps Dell Technical Support to identify which hardware component is causing the issue and provide repair options. NOTE: If the diagnostic test fails, make a note of the error code and validation code that the diagnostic test provides. It is called the SupportAssist Pre Boot System Assessment or Enhanced Pre-Boot System Assessment (ePSA). Dell laptops, desktops, all-in-ones, and Windows-based tablets have an integrated diagnostic test. Running a hardware diagnostic test helps you identify potential hardware failure. If your Dell computer is not able to turn on, follow the troubleshooting guide for no power symptom in the table below.If your Dell computer can turn on but is unable to boot into Windows, identify the symptoms and follow the appropriate troubleshooting guide.Connect the AC adapter or power cable and the battery (for Dell laptops).Press and hold the power button for 15 to 20 seconds to drain residual power.Disconnect all devices such as USB drives, printers, webcams, and media cards (SD/xD).To learn more, see the Dell knowledge base article How to Use Forced ePSA to Recover from POST or Boot Failure. ![]() NOTE: On select Dell Latitude laptops, try to recover the laptop using the forced ePSA method from a POST or boot failure.
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