no video output from dvd player

[jerome]

my LG tv (Model RP-21CC)doesn't have video output. it's connected to an LG dvd player (Model DK 8621N). one day, as i was fiddling with the dvd remote (specifically "setup") the video just disappeared. the audio (from the stereo system) continued though. i checked the back but i haven't touched the jacks for input/output. my friend says it might have been an ntsc/pal secam change in setting. is that possible with the tv/dvd remote? as i remember last i was changing the screen width/size. thanks for the help & info. i hope you will be able to help me solve this problem.