A technician is called to assist a customer. The customer reports when they powered on the
system, they heard a loud noise, saw a spark, and smelled a burning smell. Which of the following
should the technician advise the customer to do FIRST?

A.
Power on the system, to see if it happens again.

B.
Immediately notify the fire department.

C.
Unplug the system from the power source.

D.
Turn off the circuit breaker to the building.

Explanation:

When you hear a loud noise and see a spark with a burning smell, unplug the system immediately
from power source. This might be the case of high voltage frying the innards of the system.