I heard this one just a little bit differently:
3 engineers travel on a desert road in a good old '76 VW Beetle. One is a mechanical engineer, the second one is an electric engineer and the last one is a computer engineer.
The VW Beetle starts making weird engine noises and stops. Then, the mechanical engineer goes back, looks at it for a couple hours and gives his veredict:
"This thing needs a complete overhaul of all friction components, plus the warpage limits of the engine heads are beyond specifications..."
The electrical engineer takes over and starts staring at the engine...after three hours he gives out his veredict:
"This thing isn't working because the voltage present on the battery is not enough, and the electromagnetic effect of the generator is too low for the car to run correctly..."
The computer engineer stares at the engine bay for 6 hours, looking under the mass of cables, hoses, until he stands up and tells his companions:
"We are doomed. I can't find the reset button on this thing!!!"
or this one:
Three engineers were riding in a car: a mechanical engineer, a chemical engineer, and a Microsoft software engineer. The car stalled, and they rolled it to the side of the road.
The mechanical engineer popped the hood, looked in and said "Look. The drive belt is loose. All we have to do is tighten it up and the car will work just fine."
The chemical engineer replied "No, that's all wrong. The problem is fuel contamination. We have to drain the fuel, filter it, and then everything will be A-OK."
The Microsoft software engineer told the other two "No, I've seen this problem before. We have to get back in the car, close all the windows, shut down the car, get out, get back in, start up the car, open all the windows, and then it will run."