Power Supply Troubleshooting Checklist

Power Supply Troubleshooting Checklist


A bad power supply can cause a system failure in one of two ways. First, it may not provide power to the system at all. Secondly, it may not provide the correct voltages and/or current to the various components it supplies. Coupled with the knowledge of the basics and this step by step checklist you should be able to quickly and accurately resolve most power supply issues. Note the number of similar steps in the procedures below.


Determine if there is any sign of power at all

  • Are any lights illuminated? Check the power button, diagnostic LEDs, and flea power indicator.
  • Are there other signs of power such as fan spin or disk drive activity?

If there are no signs of power at all, check the following:

  1. Is the power cord plugged into the back of the system and into a known working power source? Again, it is important to bypass any power strips, surge protectors or UPS units by making sure the power cord is plugged directly into a known good outlet.
  2. Is the voltage selector correctly set for local power? Some power supplies are auto-switching and do not have a physical switch. For those that do, make sure the power cord is unplugged and flip the switch back and forth; again making sure it is set to the proper voltage. Plug the power cord in and test.
  3. If there is still no sign of power, the next step is to isolate the power supply as much as possible. Make sure the power cord is unplugged and disconnect the power leads from all devices except the motherboard.
  4. Any power leads to the motherboard should be reseated to ensure a good connection.
  5. Remove memory, expansion cards and disk drive data cables to insure they are not causing the failure. These components would need to be removed later to complete no POST troubleshooting anyway if the power supply is not at fault.
  6. If appropriate to the system model, test the I/O panel.
  7. If there are still no signs of power at this point, it is most likely the power supply is non-functional. If there are indications of power, continue troubleshooting to isolate the failed component.

If there are indications of power such as a blinking amber power LED, a solid amber LED, fan spin, or disk drive activity:

  1. Bypass any power strips, surge protectors or UPS units by making sure the power cord is plugged directly into a known good outlet.
  2. If the system fails to power up correctly and attempts POST, the next step is to isolate the power supply as much as possible. Make sure the power cord is unplugged and disconnect the power leads from all devices except the motherboard.
  3. Any power leads to the motherboard should be reseated to ensure a good connection.
  4. Remove memory, expansion cards and disk drive data cables to ensure they are not causing the failure. These components will need to be removed later to complete no POST troubleshooting anyway if the power supply is not at fault.
  5. If the system fails still fails to power up correctly and attempt POST at this point, it is most likely the power supply is non-functional and should be replaced. If however, the power LED is solid amber, the failure could potentially be the motherboard and Technical Support involvement may be required.
  6. If there are indications of power, continue troubleshooting to isolate the failed component. Our articles Computer Does not Turn on or go Into Windows or Resolve No Power, No POST, No Boot or No Video issues with your Dell Computer can provide additional troubleshooting to help.


acadaptor General information and troubleshooting articles can be found on the AC Adaptor support page.



Artikelnummer: SLN286235

Sidste ændringsdato: 10/04/2017 04:23 AM


Bedøm denne artikel

Nøjagtig
Nyttig
Nemt at forstå
Var denne artikel nyttig?
Ja Nej
Send os feedback
Kommentarer må ikke indeholde følgende specialtegn: <>()\
Vi beklager, men feedbacksystemet er nede i øjeblikket. Prøv igen senere.

Mange tak for din feedback.