If the INFO bar lists 720x480i, then that is the signal it is receiving. You might go into the menu of your DVD player and choose "Progressive" over the "Interlaced" setting it is on.
A progressive player can play both 480i and 480p, so you'll want to adjust the setting. Once you successfully do that, you'll likely see the resolution increased on the INFO bar.
Does that help?
is it correct that when i have a progressive dvd player hooked up to my ln32b460 that it is 480i or p when i pushed the info button on the tv said it's 720x480i