[Troubleshooting] Device Fails to Power On / Black Screen on Power-Up (For PoE Devices)

Troubleshooting Steps

1: Replace the Network Cable

Try using a different Ethernet cable to rule out cable-related issues.Replace the current network cable with a known working cable.

-If the device powers on with the new cable, the original cable may be faulty. 

-If the problem persists, proceed to Step 2.

2: Use Terminal Power Supply (optional)

Test the device using a terminal power supply (DC power input) to bypass PoE power delivery. Locate the terminal power input on the device. Connect a suitable DC power supply (ensure correct voltage as per device specifications).

-If the device powers on via terminal power but not via PoE, the issue may be related to PoE power delivery (switch or cable).

-If the device still fails to power on via terminal power, the device itself may be defective.

3: Connect to a Different Switch

Test the device by connecting it to an alternative PoE switch. Connect it to a different PoE switch that is known to be functioning properly.

-If the device powers on with the new switch, the original switch port or switch itself may be defective. 

-If the problem persists, proceed to Step 4.

4: Perform Cross-Test with a Known Working Device

Use a device that is confirmed to be working properly for a cross-test to isolate the faulty component. Take a known working device of the same model. Connect it to the original switch and network cable.

-If the known working device powers on, the issue is likely with the original device itself.

-If the known working device also fails to power on, the issue may lie with the switch, cable, or network environment, pls proceed to Step 5.

5: Reset the Device

Perform a factory reset on the device and observe whether the issue persists. Press and hold the reset button for the 10-15s.

- If the device powers on after reset, the issue may have been caused by a configuration error.

- If the problem persists, please contact the DNAKE Supptort.

6: Escalate to DNAKE Support

If the issue persists after completing all previous steps, please collect the following materials and submit them to Dnake Support for further investigation:

Provide the device model, serial number, mac and firmware version.

Document the results of each step performed above.

Provide a video showing the device failing to power on (black screen) during the power-up process.

Provide details of the switch, cable type, and PoE power budget.