Not to be flip, but the sign is that it stopped working. If by "Apple says" you mean an Apple genius or tech, then keep in mind that they know what they're talking about.
That said, why not get a second opinion from someone who can actually look at the machine? Us anonymous strangers like to help, but if your "friend"'s computer has been dropped, someone should really see it in person. There are many authorized Apple repair services, for example university computer stores, and other places that are easy to find, where a qualified technician will confirm or deny what you've been told.
That said, why not get a second opinion from someone who can actually look at the machine? Us anonymous strangers like to help, but if your "friend"'s computer has been dropped, someone should really see it in person. There are many authorized Apple repair services, for example university computer stores, and other places that are easy to find, where a qualified technician will confirm or deny what you've been told.