This may be a stupid question but please bear with me. I recently changed my DVD player from the Sony 7700 to the Pioneer 2900. Since the change I can not change the screen size (IE. stretch, full etc.) The screen stays locked in the full mode. I almost always watch movies in their correct aspects anyway but when my daughter watches hours and hours of her 4:3 Barney videos I would like to stretch the picture to minimize risk of burn-in. This may have been better posted in the DVD section but I was not sure where it belonged. I would appreciate any help I can get.