After pressing the power button on the D4-320, the fan spins for a moment and then stops, and the device cannot start. What should I do?

Applicable Models

D4-320

Check if the hard drive is properly installed — manually push the hard drive tray inward to ensure it is securely seated.
If unsure about the correct installation, visit the TerraMaster official website's quick installation guide to view the hard drive installation instructions for the corresponding model: https://support.terra-master.com/quickguide/