Check the power supply. The unit is not receiving power.
- Ensure the appliance is plugged into a working mains electricity outlet.
- Switch on the power at the outlet.
- Press the Standby ON/OFF button on the appliance base.
If that didn't work, inspect the power cable for damage. Do not use if the cable is damaged. It must be replaced by Dyson, its service agent, or a similarly qualified person.
Heads up: Always unplug the appliance before any cleaning or maintenance. Carry it by the base only, not by the loop amplifier.