The following article assists with troubleshooting a No Power scenario on your Dell desktop.
No Power can be defined as the system not receiving any power from the power source, or the power not being distributed to the system correctly. It may be more complicated to determine what is causing the No Power issue, but it is easy to identify. You may notice the following symptoms if you are experiencing a No Power issue:
No response from the power button (LED - Light Emitting Diode) stays off)
The power button displays a blinking amber (orange) LED.
(If the light is blinking a recognizable error code, please click the link to select the correct article to identify the error code.)
Before beginning a full investigation of the issue, turn off the power and check any steps that are appropriate before restarting your computer:
Check that all cables are secure in their connection (power and data cables) by replugging them, both externally and inside your system
Ensure that the wall outlet is working by trying another device on it first
Bypass any battery back-up or power strip, and, connect the power cable directly to the wall outlet
If there were any hardware or software changes prior to the issue, reverse those changes and test again
Remove any nonessential items that are connected to the system (printers, flash drives, external hard drives, etc.)
Ensure that all removable media is removed from both the system and any printer left attached to the system (disks, cell phones, SD cards)
Rule out an Issue with the power supply unit:
If you have an older system, check that the voltage selector switch on the power supply has not switched to the wrong Voltage (110v - 240v).
If the system has an external power supply or AC adapter, check the external status LEDs. Test with a known good substitute and a known good adapter cable if possible. If the fault is with the adapter, confirm the status of the adapter cable on the known good device.
If your monitor turns on and the power cable is appropriate to your computer, swap the power cable between your monitor and computer. This could rule out an issue with the power cable or socket.
Test an internal Power Supply Unit (PSU) if the BIST is available on power supply:
Disconnect the power cord. Wait at least 15 seconds before plugging the power cord back in.
Press the Built In Self Test (BIST) button on the back of the power supply. Check to see if the LED lights up for 3 seconds.
If the LED is off, disconnect the power cord.
Unplug any internal power cables from the power supply to the motherboard and internal devices.
Reconnect the power cord and try the BIST button again, did the result change? (If the light comes on, something that is attached to the motherboard could be causing an issue. If the LED is still off, the power supply is at fault.)
Test the internal power supply if the BIST is not available on the PSU:
To check the power supply, swap it with one from a similar working computer and see where the fault goes. (If the fault follows the power supply - it is the PSU. If the fault stays with the computer, some other device is at fault.)
If no swap is available, you should go to the next step.
If the PSU checks out OK or you are unable to troubleshoot it, then move on to troubleshooting the internal components of the PC:
Unplug the Power Cord
Disconnect the cables from an internal component (i.e. the Optical drive, the Storage drives, the memory, etc.)
Connect the power cord after disconnecting each component and test if the system powers on. (If it does you have identified the component or connection stopping the PSU from powering on. If it does not move on to the next component.)
With these checks complete, you should have a good idea if the fault is external to your computer, an issue with the power supply, or an issue internal to the computer. If the issue continues or is intermittent, please see the section below for links to more articles that can assist with troubleshooting further. If you have identified the faulty part, please contact us with your troubleshooting so we can resolve the issue. If your computer is out of warranty, we can advise how much it would cost to resolve.
The articles below are a guide to various desktop diagnostics LEDs and what they mean:
If your computer is getting power but still does not start up, then please check out the articles below for further help:
If you are looking to troubleshoot a Notebook system, then please check out the following link for further troubleshooting steps to identify your issue:
Article ID: SLN285154Last Date Modified: 08/06/2020 08:46 AM