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Question: changing coby dvd938 home theater system back toAamerican broadc

I was playing around with the picture and selected mulit. when i did that the TV just acts like the horizontal lines are going round and round. I need to get it back to the American broadcasting way. I cant set it back to factory defaults like it says on the cover, but when I put a cd in it works fine. the manual says it only displays that screen when the disk is out. I am about to set it on fire. Can anyone help me?????