Are users' manuals really useful?

We have many types of products all around us and all of them come with users' manuals, which, though useful in learning how to use the product, hardly give a clue on how to solve any problems which arise.

What do you do then? Check out the forums on the internet, ask people, or search in existing posts. So here's my idea....

Why don't product manufacturers bundle a CD or something which contains saved pages of these forums a searchable format? Or, have a book of all these posts collected and an index at the back? That way, people can get the real help they need. :)