Hi Kevin,
I had a problem with the IDE cable in one of my Centrals that prevented the unit from booting up. Of course, it was my fault for swapping the hard drive in and out a few times.

If I were you, I'd try another hard drive and use the original CD that came with the unit and initialize it to see if that might be the problem...Otherwise, please post some additional symptoms and we can help you with some badic troubleshooting....Thanks, Randy