won't play music

My sandisk M240 has not been used much at all.  Suddenly, it won’t do anything but turn on.  The Sandisk screen won’t advance. How do I reset this player?

Take out the battery, connect the player with the computer and see if it will show under my computer. Disconnect the player from the computer, put a brand new battery and hopefully that will work. If not I will suggest you call SanDisk tech support.