MP4 player wont show up on my laptop screen???

Grace - Sep 25, 2014 at 07:48 PM
i have had an MP4 player for a couple of years now and i have only just learned how to put songs onto it. all of a sudden... it wont show up on my macbook pro's screen. im not sure if it's my usb cord or the device it's self?
all answers are appreciated. thankyou