The moment you have been waiting for.

Make sure your "Ducks are in a row"

Be patient, don't rush, take any necessary precautions to avoid further damage of unit or associated devices.

Start by keeping the unit isolated from other devices to prevent spreading damage in the event retest fails.

Perform a systematic startup, by making sure the power switch is off, power connector is plugged into back of unit, then plugging in wall power pack into wall receptacle.

Be prepared to disconnect power quickly by having a helper ready to unplug the wall power pack.

Turn unit on and carefully observe if there is any sign of life, along with any issues such as electrical arching noise, smoke, smell ...