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If you have changed nothing else in your account and you are on post-pay billing setup, ads should be running.
If you are on pre-pay you can check your ballance, maybe it's depleted.
This problem could be account specific, so feel free to use the phone from this link to contact Google and have a Tech support person take a look at your account and maybe return here with an answer for all the other users to learn the solution :
Sign up for AdWords!
