Your post is a good example why code tags are important. Please edit your post and add code tags.
A problem has a occurred with being able to detect the I2C sensor itself. The data is being transmitted to the device yet it won't read and the values that are being displayed in the serial monitor are all at maximum possible.
I would expect that this sketch writes "TCS34725 not responding" to the serial interface if the sensor is not connected. What exactly do you get if you don't connect the sensor?