not really, can only be fixed by sending back to factory which is not an option for you....try if it boots without the hard disk.
Have you tried plugging it into a PC via USB? IF that doesn't work, then perhaps your unit wasn't a real pmp400, and the firmware isn't compatible. There are some warnings about this.
Another thing you could try is to remove the hard drive, hook it up to a PC via USB using a cradle, and reformatting the drive using fat32format. then put it back into the pmp.
I'm running release #10 with no problems.
pmpPlay