From my brother, he´s a Computer Engineer.

Three engineers get into a car. The one who drives tries to start the engine, but it doesn´t work.
"I think it´s the engine", says the Mechanic Engineer.
"I think it´s something electronic", says the Electronic Engineer.
They turn to the Computer Engineer, who´s still thinking, and ask, "And you, what do you think about it?"
He thinks for another few seconds. Then:
"Ok, let´s try this. Let´s get out of the car, get in again, and retry to start."