Thanks for your email. Sorry for posting in the wrong area. I formatted the player, and re-installed it manually, and Rockbox now boots up.
However, I do still have a problem. Rockbox will allow me to go in to an album but, when I select play nothing happens. I have removed, and re-installed the music / Rockbox firmware but the problem still exists, and idea why, and how to fix?
Apologies again for posting in the wrong area.