If I asked a question a long time ago that has yet to be answered, has stopped getting views, and has all activity has come to a stop, is it ever appropriate to re-ask the question with whatever new info you may have gathered elsewhere?
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To provide a similar but slightly different viewpoint to Mark's -- it can be OK to re-ask a question, but only if the original question was asked incorrectly or in a way that confuses answerers and invalidates the existing answers.
In this case, I think it is OK to flag the question for deletion (or, delete it yourself if it has zero answers) and re-ask with an improved, clearer question.
It's never appropriate to re-ask a question. If you have new insights that might help a question get answered, you can edit it to add that information, or you can add a bounty to the question, which will bump it to the front page and add it to the featured tab.
More information: What if I don't get a good answer?