Like Wikipedia, please assume good faith.
The poster was probably desperately searching for the answer, and having found it probably is distracted by putting the solution into action.
Yes it is poor practise to post a question and not let people know if it was solved elsewhere, but if we lambaste every new poster who makes an error of etiquette, other potential new members won't even bother to ask questions and the forum will eventually die out.
I would suggest not making repeat attempts, particularly not multiple PMs (as many existing forum members struggle with these, new members never notice the flashing icon.)
If the answer is more than a few sentences, the best policy with first-time enquiries is to ask for a bit more detail or just offer to help and see if the original poster takes up teh offer.
Neil