Diagnosis
The appliance is receiving no power, indicated by all lights being off. Since you've confirmed the wall outlet is functional, the issue is likely with the oven's internal power connection, a tripped internal safety thermostat, or a failed main control board.
How to Fix It
First, perform a complete power reset: unplug the oven from the wall outlet for 5 full minutes. While unplugged, inspect the power cord for any damage. After 5 minutes, plug it directly back into a dedicated wall outlet (not a power strip or extension cord). Then, set both a cooking function (like "Air Fry"), a temperature (e.g., 350°F), and a time. The unit requires all three selections to engage. If it still doesn't power on, check for a reset button (often a small, recessed hole) near the power cord entry or on the back panel; use a paperclip to press it.
If That Didn't Work
If a full reset doesn't work, the internal thermal fuse or control board has likely failed. These are not user-serviceable components. Do not disassemble the unit. The final step is to contact Emeril Lagasse Customer Service at 1-844-551-2253 or the retailer where you purchased it for warranty support or repair options.
Heads Up
Never operate this high-wattage appliance on a power strip, extension cord, or shared outlet with other major appliances, as this can cause an overload and permanent damage to the oven's electronics.