How to Troubleshoot Power Issue on a Dell Desktop or All-in-One


How to Troubleshoot Power Issue on a Dell Desktop or All-in-One


Article summary: If your Dell desktop or all-in-one computer is not able to power on, follow the troubleshooting steps to help you resolve power issues. Learn how to perform basic checks to identify why your computer is not able to power on.

Symptoms

  • Dell desktop or all-in-one is not able to power on.
  • Power LED on the desktop or all-in-one is off.
  • Power LED on the AC adapter of the all-in-one computer is off.
  • None of the LEDs on the desktop or all-in-one respond when you press the power button.
  • There is no LED or sound indication that the desktop or all-in-one is powered on.

Troubleshooting

Follow the troubleshooting steps below. Expand the sections below to learn how to perform each troubleshooting step to identify the cause of the power issue on a Dell desktop or all-in-one.

Most often, restarting the computer resolved many issues. The residual power in the computer may cause the laptop not to power on. Follow the steps below to drain the residual power.

  1. Power off the computer. Press and hold the power button for 10-15 seconds.
  2. Disconnect the power cord from the computer.
    Note: Dell all-in-one computers may either come with a power cord or an AC adapter. Disconnect the power cord or the AC adapter depending on the configuration of the computer.
  3. Disconnect all external devices or peripherals like USB drives, printer cables, and media cards (SD/xD).
  4. Press and hold the power button for 15-20 seconds to drain residual power.
  5. Connect the power cord to the computer.
  6. Power on the computer.

If this did not resolve the issue, proceed to the next step.

The power cord, AC adapter cable, and power cables may get frayed or cut, and wires may become exposed at either end of the cables. This may be due to the way the cable is wrapped around the AC adapter, or if the cable is subject to undue stress. If the damage is severe enough to expose wires, you should discontinue using the power cord or AC adapter. To check the power cord, AC adapter, cables, and the power port on the desktop or all-in-one for any damages:

  1. Unplug the power cord or AC adapter from the wall outlet.
  2. Unplug the power cord or AC adapter from the computer.
  3. Check the power cord or AC adapter and cables (including the power cable) for signs of physical damage or overheating.
  4. Check if the pin inside the plug or adapter port is bent, broken, or damaged.
Caution: Dell recommends using the Dell-branded AC adapter that was shipped with the all-in-one computer. Dell does not recommend using third-party AC adapters.
Warning: Grasp or hold the plug and not the cable while disconnecting the power cord or cables.
Warning: Dell AC adapter for the all-in-one computer works with electrical outlets worldwide. However, power connectors or power strips may vary among different countries.
Caution: If the power cord, AC adapter or cables are damaged, discontinue using the power cord or AC adapter immediately.

If you notice a damage, contact Dell Technical Support for repair options. If you do not find any damage, proceed to the next step.

  1. Unplug the power cord or AC adapter from the wall outlet.
  2. Connect another device on the wall outlet to verify if the wall outlet is working correctly.
  3. Try a known-good wall outlet.
  4. Plug the power cord or AC adapter directly to the wall outlet.
    Bypass any power regulators like surge protectors, UPS (uninterruptible power supply), power splitters and so on.
  5. Power on the computer.
Note: Dell desktops and monitors use similar type of power cords. To isolate if the power cord is working correctly, swap the power cords between the desktop and monitor.

If the power cord and the wall outlet are working correctly and the computer is not able to power on, proceed to the next step.

Reseat the AC adapter by following these steps:

  1. Unplug the AC adapter from the wall outlet for 15 seconds.
  2. Unplug the AC adapter from the computer.
  3. Plug the AC adapter to a known-good wall outlet.
    Bypass any power regulators like surge protectors, UPS (uninterruptible power supply), power splitters and so on.
  4. Plug the AC adapter to the computer.
  5. Check the LED indicator on the AC adapter.
Note: The LED indicator may be located either on the AC adapter brick or the adapter (DC) plug.

If the AC adapter LED indicator is on, proceed to the next step.
If the AC adapter LED indicator is off or turns off when it is connected to the computer, contact Dell Technical Support for repair options.

It is important to verify that the voltage selector switch on the power supply unit is set to the correct voltage based on your current location. The power supply unit (PSU) of certain Dell desktops allow you to change the voltage from 110V to 220V depending on your current location.

For example, the standard voltage supported in the United States is 110V and 230V to 240V in the United Kingdom. Ensure that the toggle switch on the power supply unit (PSU) is set to either 110V or 220V based on your current location.

Note: If the voltage selector toggle switch is not available on a Dell desktop, the power supply unit (PSU) of that desktop computer can automatically identify the voltage.

If this did not resolve the issue or if there is no voltage selector toggle switch, proceed to the next step.

Dell Inspiron, XPS, OptiPlex, Precision and Vostro desktop systems include a power supply with a built in self-test (BIST) feature that helps diagnose the health of the power supply unit. The LED indicator on the PSU helps identify if the power issue is caused by the power supply unit.

Note: Certain older models of Dell Inspiron, XPS, and Vostro desktop systems may not be equipped with a PSU built-in self test. To learn more, see the Dell knowledge base article How to Run a Power Supply Unit Self Test On a Dell Desktop or All-in-One Computer.

How to run the self-test using the button on the PSU

  1. Turn off the computer.
  2. Press the BIST button on the computer and check whether the LED lights up.
  3. The light should be solid on not flickering or flashing and the power supply fan should also turn on to speed. If the fan is not spinning up properly this should be considered a BIST failure even if the LED lights up.
  • If the built-in self-test LED turns on, then the power supply unit is able to deliver power to the system board.
  • If the BIST LED does not light up, then the power supply is not able to deliver power to the system board and could be caused by any component connected to the power supply or the power supply itself. The next step would be to isolate the source of the power failure by disconnecting parts from the PSU, see the Dell knowledge base article Resolve No Power, No POST, No Boot or No Video issues with your Dell Computer.

How to run the self-test without the button on the PSU

  1. Turn off the computer.
  2. Disconnect the power cord from the PSU, and wait for 15 seconds.
  3. After 15 seconds, connect the power cord back to the PSU.
  4. The LED light should stay on for 3 seconds and then turn off.
  • If the built-in self-test LED turns on, then the power supply unit is able to deliver power to the system board.
  • If the BIST LED does not light up, then the power supply is not able to deliver power to the system board and could be caused by any component connected to the power supply or the power supply itself. The next step would be to isolate the source of the power failure by disconnecting parts from the PSU, see the Dell knowledge base article Resolve No Power, No POST, No Boot or No Video issues with your Dell Computer.

If this did not resolve the issue, contact Dell Technical Support for repair options.

Helpful videos

Learn about Built In Self-Test on Desktop Power Supply

Duration: 02:56
Closed captions: English only



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Article ID: SLN285154

Last Date Modified: 10/06/2020 04:08 AM

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