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When this happens you can try the wide/picture format/view mode button on your television's remote control first. If your remote does not have one or if this does not correct the problem check the resolution on the cable box next. If your television displays 720p make sure the cable box is set for 720p, or 1080i if the television supports that resolution. First you have to make sure your tv in on the right input not the tv tuner input. Then use the hdzoom# button on the cable remote. If you have a satellite remote it might say format or aspect or you might have to go into the cable box/satellite receiver menu and choose 1080i crop or 1080i stretch to get the right picture size.
I take it that you have watched many hours of 4x3 video on this 16x9 TV . What you see is evidence of screen burn, like they used to warn about with the old "pong" type games with stationary objects. The 4x3 pattern is burned into the phosphor in the projection tubes. the area of the burned pattern is not as efficient as the unused areas that make up the 16x9. If you watch enough 16x9 it may even out somewhat, but will never be perfect. Replacing the tubes will fix it, but they're pricey, and you may be subject to it happening again, depending on your viewing habits.
I'm using a component dongle from an ATI x800. Never have had a problem. My resolution is 1664x936. I noticed that this RCA auto formats the screen size with the DVI-D or component, so you'll have to make the adjustments via your video card. Windows display properties might not let you select that resolution, so hopfully your video card software will allow you to pick a resolution. It would not let me use any kind of 720p resolution only 1080i settings would work.
First thing to look at would be the source, make sure that this source whatever it may be is set to display a 16X9 format. Your set may simply be showing what it see's and it may be seeing the 4X5 format and giving you a problem