All of the computers lost their power is the correct answer.
A personal pronoun must agree in number with an indefinite pronoun when it is the antecedent of a personal pronoun. To refer to a singular indefinite pronoun, use a singular pronoun. "His or her" is regarded as a singular pronoun.
The name of each car's sponsor is painted there. (singular)
To refer to a plural indefinite pronoun, use a plural pronoun.
The race is several of the cars' maiden outings. (plural)
Singular or plural forms are possible for some indefinite pronouns. To decide whether an indefinite pronoun is singular or plural, consider the context of the sentence.
Some of the machinery was still contained within its packaging. (singular)
Some of the teams competing in the event were still seeking their gear. (plural)
Learn more about indefinite pronouns here:
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