My ipod is corrupted and when I try to reset it it will not let me, I tried using the diagnostics feature but its not working? Help please!!

I dropped my ipod classic and i tried turning it back on and it asks me to plug it in. I did so and it said the data was corrupted. I tried resetting it and it said something about fire wire? I looked on the internet and tried setting it to "Disk mode" and plugging it in and trying it that way, but it doesnt come up on my itunes. I tried diagnosing the issue on the ipod itself and I get to the "Accessorize test" and it says I dont have a FWPWR. How can I fix this??