Any digital source must have its input assigned (page 31 of the manual). The DVD player has a role in this, too. Try another cable or input. To reset the AV receiver to its factory defaults, turn it on and, while holding down the [VIDEO 1] button, press the [STANDBY/ON] button. "Clear" will appear on the display and the AV receiver will enter
If you have the manual, crack it open and follow it's advice for your symptom. Then look at every indicator and control to evaluate how it fits into your desired listening experience. UNDERSTAND the receiver or you will forever have issues with losing the 'sound' because a seldom-used control got touched by mistake.
Register and download the manual for free at retrevo.com
http://www.retrevo.com/support/Onkyo-TX-SR503-Receivers-manual/id/365ag216/t/2/
If you still feel a reset is necessary look at page 57 or search the document for "factory defaults".
Standby mode.
I think that all depends on how you have it set up, I'm guessing that you have the speakers connected to the DVD player, however I'm not sure if you have any audio cables running from the TV to the DVD (required if you want this for sound from your TV), I'd check your configuration, as it sounds like you have not got this set up right.
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