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The following article provides information relevant to your question:
Reset your account password
If your account was partially disabled for security reasons, use iForgot (http://iforgot.apple.com/) to reset your account. This should restore your access to the disabled services. You can also click the “Reset Password” or “Forgot Password?” buttons that appear in the alert message.
Note: If you are an iCloud user, when prompted to enter your Apple ID, be sure to type your full email address. For example, firstname.lastname@example.org or @mac.com.