No, I only have the one HDD that came with the new 520c. my bashed up 520c didnt have an HDD.

I reformatted the HDD with the legacy CD when i finally got it to startup. I had also unhooked the HDD to see if it wasnt a hard disk driver causing the problem, nope...

But when I did the PPC swap the first time, i tried to fire it up off the oriignal system that was installed on the HDD and it told me the startup disk wasnt for this model, and thats when i started having all these issues. I zapped the pram btw.