If you had a 10 and a 20 gig drive, and you removed the 20, then the reason nothing is playing is that the 10 is completely blank, it has no songs. That's because of the way songs are stored on a two drive player.

What you need to do is either solve your disk drive problems and get the 20 working again, or use the builder image to format your 10 gig drive from scratch, reinstall the player firmware onto it fresh, and reload your music back onto the player from your PC.