It's possible the person asking a question knows their stuff. It's possible. But we don't know that, which is why we ask probing questions.
Day 1, you ask: "Have you tried to [blah blah] your [woo hoo]?"
Day 2, you ask "Have you gotten all the latest [goo mo]?""
Finally day 4 or 5 comes around and you finally admit that you can't help (something you actually knew on day 1), but now the thread is pushed down, off everyones radar, and is filled with complete crap initiated by you. All because when you didn't know the answer, you decided that you must get involved anyways.
Do everyone in the world a favor and don't get involved when you don't know the answer. Don't pretend to be more than you are. The feel-good moment you get when you click "post" is a sham - you are harming the other person, not helping them.