Originally Posted by HDMI:
“In settings it is set to PUSH in sounds it is set to DING and it does not now ding”
But what does it say for Fetch in the Fetch New Data settings page? If that is set to manual then you may get exactly what you describe in the OP. If Push e-mail does not work for some reason then the iPad will use the Fetch setting as a sort of back-up to retrieve messages.
So if you have it set to Push and Manual under Fetch and Push is not working then the iPad will only ever retrieve messages when you explicitly run the Mail app. You won't get any background retrieval of messages and hence no notification sound. In simple terms the iPad isn't telling you about new messages because it doesn't know there are any.