I pressd a button while playing with an LG G Pad x 8.0 that a friend gave me and the display went to black and white.  How can I get it to go back to color?

ctel

    When the device powers up with the T Mobile screen, it's in color and then goes to a black and white or grey scale kind of scheme and nothing I do brings back the color.  The wall paper screen with all the brushes and paints in black and grey is particularly impressive!

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