Well if it was a technical problem with the site you should just contact a Moderator or the site Administrator and they will get to the bottom of it, might take a few days or so but that's better than starting over from scratch, especially if you've been here a while and built up rep and status, however if you did something wrong like broke the rules or something you might have gotten in trouble and put on "Restriction" so to say and may not be able to post/reply for a couple days, you would have gotten a PM from a Mod or Admin explaining the situation if that was the case though.