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Power on or off doesnt matter. If there are cables attached or any conductive surface large enough to act as an antenna (around 32inches), the radiation will be absorbed and follow any available path to ground through the components.
This depends on the type of EMP.
If it is uwave radiation, the above applies. The effects are the same as metal in a microwave oven: there is a buildup of micro(u)wave radiation in the materials until discharge. In electrical components, anything solid state is permanently fused. This is the type of EMP generated by a nuclear detonation. Most shielding consists of a "cage" surrounding the sensitive systems to absorb the radiation and drain it to ground. Everything within the shielding must be completely independant, isolated from, and have no direct connections through the shield. If a cage type system is not used, then transorb diodes are usually placed at all entry points into the circuitry, allowing any significant overload to drain safely to ground.
If the EMP is an intense focused magnetic field, the collapse of the field will induce a massive buildup of energy in any device within the field. Same as above, the energy will discharge destroying many components, but it is possible for some tougher components to survive and simply be stuck open until the energy dissipates. EMP's like this can affect anything from wrist watches to airliners, and shielding has little effect.
Originally posted by SIRR1
In fact, you can enjoy much of the "high tech" life style you've come accustomed to even after the use of a nuclear device has been used by terrorists—or there is an all-out WWIII.