원문 게시자: Dan ,
If your system is in the middle of an OS update you don’t want to shut the system down! Let it do its thing without disruption! I fear you corrupted the system! Depending on what it was in the middle of you might be able to recover it using what @v3nuo posted above steps from Apple. If that fails to work you’ll need to bring your system into Apple to get them to fix it.