Sansa e250 Wont Boot!!!

[EnchantedPlague]

I just tried to install rockbox on my sansa e250 using the install utility. IT downloaded the files but i didnt see any activity on the mp3 player. When it said it was done, i unpluged it and tried to boot. It says, cannot load rockbox file not found. Then when i try too boot into the oigional firmware it says cannot load from partition bad checksum cannot load /System/OF.mi4 cannot load System/OF.bin. Now what? Is my MP3 player garbage?
P.S. I use OS X leopard!

[MarcGuay]

Try reinstalling Rockbox again (not the bootloader, just the firmware).