For example, if the problem was resolved without answering the question, how do you deal with the question so that it doesn't remain opened.
Perhaps a device was replaced, or a different software was used in the end, and the question is now meaningless, yet the problem resolved.
Here's an example on superuser. Here's another one on stackoverflow, where the problem was in the question itself. How do you deal with those kind of questions? leaving them opened seems the wrong thing to do...