You have one of several possible problems, ranging from best case scenario to worst case scenario:
A DVD video that is supposed to be black and white - try a different disc.
Some setting on the DVD player is set to monotone - check manufacturer's instructions
A bad set of cables connecting the dvd player to the tv - test a known good set of cables
A bad output on the DVD player - test DVD player with a different TV.
A bad input on the TV - try another input if possible, test TV with a known working video input.
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