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Samsung PN42A450 shows vertical black bars on SD channels

When I first bought this tv my SD channels would show in full screen then I tried out an HDMI cable and started showing all of my SD channels with those vertical bars. I changed back to the regular HD cables and plugged the HDMI into my xbox but I'm still seeing the black bars. Its only on my SD channels. My HD channels are fine. If I switch the picture size from 16:9 to widescreen then its fine but then it cuts off a little of the HD channels. This is probably an easy fix but I just can't figure it out. Please help Happy

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