Interesting question!
There are tasks that a computer can't do, because simply it isn't programmed to do.
And there is the problem!
That's why nowadays A.I is a big thing, it allows machines to have the "intelligence" and the ability to learn like us.. humans. When we were born, we didn't know everything out there.. just like A.I powered machines. As long as it is always learning it will reach a point that machines will have equivalent intelligence as us but they will be unable to answer questions that we can't answer!