The power supply diagnostic LED located on the back of the computer indicates different states of the power supply. To test the power supply, press the power supply test switch.

If the power supply diagnostic LED is green, power is available for the power supply.

If the power supply diagnostic LED is off:

The power supply is not receiving power — Ensure that the main power cable is connected to the system.

The power supply is not working — This issue occurs either due to a bad power supply or a device attached to the power supply.

To resolve the issue, contact Dell (See "Contacting Dell" on page 141).

Beep Codes

Your computer may emit a series of beeps during start up. The series of beeps is called a beep code and can be used to help identify a problem with your computer.

If your computer emits a series of beeps during start-up:

1Write down the beep code.

2Run the Dell Diagnostics to identify the cause (see "Dell Diagnostics" on page 95).

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Troubleshooting Tools

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Dell PP521, DCDR01 owner manual Beep Codes