Ahmir Butler

So, I'm trying to do Step Up Lessons. And in every source I look, they just select the song and press 1(listen). however, when I do that it starts playing pre-recorded sample sounds. I don't really know what to do since I'm not familiar with digital pianos, just need someone to point me in the right direction. Thanks in advance! I have a CTK-2400.

Recently my CTK-2400 was Shutting itself off whenever I played it on any volume above halfway, but now whenever I turn it on, It just immediately turns itself off, and if it doesn't turn Itself off, it'll turn off as soon as I press any notes. My son lost the power cord, so batteries are my last resort. Am I going to have to replace it?