Reading the article, it was not a power failure. They had communications network problems and could not isolate the offending launch control center, so they took the entire squadron offline and brought up LCCs one by one.
This is troubleshooting.
I suppose they could have shut them off one by one, but since all 50 missiles were FUBAR, the approach of shutting them all down first may have brought more of them back on line faster.
To most so-called journalists those are identical problems :-)