At our shop, techs are required to have A+ before we will consider hiring them. The real interview is what we call the Machine From Hell. We cause 4 hardware errors and 4 OS errors to the machine, with different difficulty levels on each. Then the prospective tech is to write down what he finds and fix it if he can. It really weeds out the wanabees. And as I remember from my time on the machine, it also shows how they work under pressure.

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The problem with your machine sir is that the nut behind the wheel has a screw loose.