My NS stoped working. Not sure how I can be more straightforward than that.
The above post is as useful as saying, "My car won't start" and then upon questioning, pointing out that somebody stole it from the garage so you can't start it now.
Perhaps by quoting the error message, telling us what steps you took to get to that point, or other useful information, we might be able to provide helpful advice. As it stands, the best you'll get from me is "awww, that's too bad."
I now notice that your Last login was 4 hours ago. You could have had the courtesy to post again once you got back in.