cisco phone & power questions

school district installed cisco phones awhile ago - and wife just moved to new school and her phone is not working...

basic questions - What are the basic steps and observations on the phone ? How to tell IF it has PoE power - but may NOT be configured ? or - may have power - but RJ-45 is not on switch or port not activated ? or - ???

thanks for the basic diag steps to look for - prior to school tech coming around -

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