Check the menus in your DVD player. This happened to me, and it was a simple matter of changing some audio settings.
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Perhaps as is said here, the hand shake didn't get done right. Powering up again following a check on the connections should do it. otherwise, on my Onkyo receiver on the front drop down panel there's a button which enables HDMI use... pressing the button until you see "YES" ought to take care of it.
or the player needs some rechecking in it's setup menu just to be sure.