What should he used to extinguish a computer fire?

ANS:C - class c extinguisher

Class A:

Class A fires are fires in ordinary combustibles such as wood, paper, cloth, trash, and plastics.

Class B:

Class B fires are fires in flammable liquids such as gasoline, petroleum oil and paint. Class B fires also include flammable gases such as propane and butane. Class B fires do not include fires involving cooking oils and grease.

Class C:

Class C fires are fires involving energized electrical equipment such as motors, transformers, and appliances. Remove the power and the Class C fire becomes one of the other classes of fire.

Class D:

Class D fires are fires in combustible metals such as potassium, sodium, aluminum, and magnesium.

Class K:

Class K fires are fires in cooking oils and greases such as animals fats and vegetable fats.