Why aren't the words on the screen displaying?

My Sandisk Sansa Clip+ works just fine, however the words on the screen (song titles, artist, settings, etc.) Are not working. For example, when I turn it on, the first thing you're supposed to see would be “music". Mine doesn't show that. I can click it and go in and play the music, but I can't see any of the words and it makes it very difficult to navigate. Imagine trying to navigate your phone with the apps having no pictures or words to tell you what it is until you click it. Also, everytime you add a few apps (songs) all your other apps shift so you have to try to figure it all out all over again. It's very frustrating. Please help!!