Why isn't the control panel responding?

please troubleshoot as follows:
1. Check if the power plug is securely connected
2. Verify the unit is properly installed; the arrow pointing to the lock icon indicates correct installation
3. Verify if the child lock is activated. When enabled, the machine cannot perform other operations; disable the child lock.
4. Inspect the touchscreen for dirt, water stains, or other foreign objects. Clean the screen thoroughly.
5. Restart the device. If the issue persists, send it for repair or request a replacement."