I have a dvd player the problem with it is, it shows a white and black picture either playing with a cd or usb

SOURCE: sony dvp ns50p dvd player

If you are using the s-video jack to connect the DVD to the TV, the jack could be loose or the wire could be bad. The s-video cable has 2 signals, the black-and-white (luminance) and the color (chroma). If the chroma signal is not getting through, the picture will be in black and white.

SOURCE: DVD plays only in black & white

Try turning on component (cable) for the V2 input  on your TV

SOURCE: SONY DVD PLAYER DVP-SR200P BUT IT ONLY SHOW IN BLACK AND WHITE ?

You have posted this in the Panasonic DMR-ES30VS section.
Please note which product section you are in before posting your question.

For the Sony DVP-SR200P there could be multiple reasons for it only showing in B&W.
Was this a recent problem, is this a new hook-up, has it always been this way?

1. In the setup menu there is a setting for Custom Picture Mode.
   Could someone have turned the color down?
   You can go to the setup menu and "Reset" the player to the factory settings.
   
2. How is this connected to your TV?
   Check all cables to make sure they are plugged in, test each one by unplugging it, and then plug it back in fully.
   
   If you are using a composite cable (1 cable yellow plug), be sure you have plugged it in from yellow to yellow.
   
   If you are using the component (3 cables red-green-blue plugs) hook-up, be sure you are using cables only designed for component hook-up, and have plugged them in correctly, red to red, green to green, blue to blue (Be sure you've plugged the red cable into the red video not red audio).
   
   Are the cables in good condition?
   No breaks, loose connectors, they weren't smashed under a piece of furniture?
   Have you tried a different set of cables?
   
3. Test the DVD player on another TV.
   Does the same thing happen?
   Did you "Reset" the DVD player?
   Maybe the DVD player is bad?
   
4. Find another DVD player and test it with your TV.
   Does it work OK, or is it black and white too?
   Maybe the connectors on the TV are bad?
   Is there a custom setting on the TV for that connection?
   On some TVs you can adjust the settings for each input (INPUT 1, INPUT 2, ....) maybe the color setting is turned down?
   

SOURCE: my dvd player only plays movies in black and white

my dvd player only plays movies back in black and white...not color. why?

SOURCE: Picture only shows in black & white when playing DVD

Same problem with an older JVC player. One end of the S-video cable was loose. Pushed in in tight and everything ok again. Cheap fix if it works for you.