Support No notification sound for messaging app

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http://androidforums.com – My S3 messaging app notification doesn't seem to work. Every time people send me a sms I am not aware of unless i go into the messaging app. There is no sound and notifications and vibration. I checked this forum and none of the answers help. My S3 is updated to jelly beans recently and thus, I don't have this notification box when I slide the top bar down. So I go to setting>sound>notification and make sure it is checked. i went to the message app setting and also make sure the notification is checked. I also make sure the notification sound volume is full blast. And I changed my r (General)