A little help on fixing my DVD player?

My DVD player was working very well when I last watched a movie there. And the next day, when I tried to watch another movie, it played the movie but it's in greyscale. I don't think the problem is in the television because I can watch TV shows with colors. Maybe it's the player? Does anybody have an idea what happened? Answers will be appreciated. Thanks :)
 
Check and make sure the cables are correctly plugged in.

Try other cables.

Try another input on the TV, or another TV.

Try another device on that input or TV, using that same cables or another cable.
 
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