System comprising a determining unit that determines whether a power supply is from a fuel cell assembly and a setting unit for setting operation mode as a fuel cell assembly

摘要

A computer system of this invention includes a power input terminal which is provided outside a personal computer, and an external fuel cell assembly connected to the power input terminal. Hence, a computer system in which water produced from the fuel cell assembly is prevented from entering the computer can be provided. A personal computer for which an operation mode for deriving the personal computer by a fuel cell assembly is prepared to prevent any trouble due to user's misunderstanding can be provided.