I've had this unit for a over a year now (it was a refurb), generally works very well. I've been running Rockbox 3.6 on it since it was released. A couple of days ago (after having used it earlier in the day, I started it up, but it did not proceed beyond the screen with the Rockbox logo and version display (3.6).
I can shut it down if I hold down the "menu" button long enough, but in numerous restart attempts it does not proceed past the Rockbox version. I can reboot with the original boot loader. I have reinstalled Rockbox (including the bootloader), no change.
Any ideas?
Later...
I finally looked inside the .rockbox directory and saw that there were junk entries -- clearly the filesystem had become damaged. I renamed .rockbox to .junk, deleted as much of the contents as I could, ran chkdsk, reinstalled Rockbox, and now it is working again. I still have one file left in .junk with a filename that Windows can't deal with (has high-bit characters in it), but I can just ignore that.