If your Dell desktop computer is not booting up and only displaying a flashing yellow or amber power button, it indicates a power failure within the computer. A diagnostic button and light on the power supply can help identify the component at fault. Disconnect all external devices except for the power cable and press the diagnostic button. If the light turns green, an external device is at fault. If the light remains off, internal components need to be checked. Start by isolating and testing the power supply, then reconnect one power lead at a time to identify the failed component. If a failed component is identified, contact Dell Technical Support for assistance.
If your Dell desktop computer is not booting up And is only displaying a flashing yellow or amber power button, This can indicate a power failure somewhere within your computer.
A diagnostic built into your computer's power supply can help you identify The component at fault. The diagnostic button and light are located on the back of the computer On the power supply.
When the system is functioning properly, the light should turn a solid green While the diagnostic button is pressed. If a failure is identified, the light will remain off.
The first step is to disconnect all external devices from your computer, Except for the power cable, and press the diagnostic button.
If the light now turns green when pressed, this indicates that one of the external devices That was plugged into your computer is at fault. You can try plugging your devices back in one at a time And retesting to find the failed component.
If the light remains off with all external devices disconnected, We will need to identify the internal component causing the power failure.
To do this, we will need to open the system chassis for additional troubleshooting. Be sure to disconnect the AC power cable from the computer And touch part of your system's metal chassis to discharge any static electricity Before removing or reseating any internal components.
It is best to start by isolating and testing the power supply itself. To do this, follow each of the cables coming from your power supply And disconnect them.
Once disconnected, plug in AC power and retest the isolated power supply. In this example, the light now turns on and stays solid when we press the diagnostic button, Indicating that the power supply is able to generate and deliver power on its own, But another internal device is causing the power failure.
To identify it, we will need to reconnect one power lead at a time And retest the diagnostic until we find the component that causes the failure.
With the motherboard power lead plugged in, the light remains green, So we can rule that out as a possible failure. The processor power lead also passes the test after being reconnected.
The optical drive, however, appears to have triggered the failure When it was plugged back in. To confirm, we can remove it and test again.
If you manage to reconnect all of your cables and devices without a test failure, It is possible that the bad connection existed somewhere in your computer But has been resolved by reseating the component.
If you identify a failed component, however, you can contact Dell Technical Support For additional assistance.
