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Error Code Power LED off, all other lights including USB inactive with physical power connection verified via adapter green light

Physical Power Switch not enabled or faulty internal switch preventing unit from powering up.

? What Causes This

Toggle mechanical issue in Power button location on the back side of router, circuitry malfunctioning at power input detection.

Toggle Power Switch manually and confirm all connections including wall socket functionality are correctly set-up.
If continuous failure, service technicians must perform a hardware investigation upon user contact.

Source: page 50 of the official manual

From the manual

This error code appears in: