Apologies
After my F10 was showing a constant system error, I installed Rockbox and it seemed to install okay, except there's no sound. My headphones are fine, and I don't think it's a hardware problem as there was no problem with the sound on the gigabeat up to the moment the gigabeat software died.
Also, when I try to skip tracks or move from the "now playing" screen, Rockbox freezes on me to the point where even the power button doesn't work and I have to switch the battery off.