Are you getting none of the bars, or just no HUD?
If all of the normal unit frames are working, but you just can't see the HUD, make sure you didn't accidentally turn it off. There's a red button at the top center of the dashboard that should say "Player/Target" -- if I says something else, then you want to click on it until it says "Player/Target" again.
If it's something else, it might help if you post a screen shot... you can just click the "paperclip" icon in the editor to attach it to your reply.
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