I can help you troubleshoot your Ecobee thermostat. Here are some steps to follow:

1. Check the power source: Ensure that your Ecobee thermostat is receiving power. You can do this by checking if the display is lit up. If the display is blank, then it's likely that the thermostat is not receiving power. Check the circuit breaker and ensure that it is not tripped.

2. Check the Wi-Fi connection: Ensure that your Ecobee thermostat is connected to Wi-Fi. You can check this by navigating to the Wi-Fi settings on the thermostat and verifying that it's connected to your home Wi-Fi network. If it's not connected, then you may need to re-enter your Wi-Fi network details.

3. Check the temperature sensor: Verify that the temperature sensor is functioning properly by comparing the temperature reading on the thermostat to the actual temperature in the room. If there's a significant difference, then the temperature sensor may need to be recalibrated or replaced.

4. Restart the thermostat: Sometimes, simply restarting the thermostat can resolve any issues. You can do this by going to the thermostat settings and selecting "Restart". Alternatively, you can also remove the thermostat from the wall and disconnect it from the power source for a few minutes before reconnecting it.

5. Contact Ecobee support: If the above steps don't resolve the issue, then it's best to contact Ecobee support directly. They can provide further troubleshooting steps and assist with any hardware issues that may require a replacement.

I hope these steps help you troubleshoot your Ecobee thermostat. If you have any further questions or concerns, please let me know.