what causes a projection tv to bow on all 4 sides of the picture

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sounds like pincushion distortion. or perhaps top and bottom hook. you need to go into your tv settings and adjust the values

not sure what kind of tv you have... but this is how it was done for rca http://www.ehow.com/how_8744072_adjust-shape-rca-tvs-picture.html

you should have some sort of adjustments you can make in your menu