So, bad news.

I put the whole thing back together, and listened to my empeg on the way to work. At the end of the day I start my car to go home, and there it is. "No hard disk found, contact support." So I take it home and open it up. The cables didn't look disconnected, but I made sure they were all in there firmly. I powered it up and everything looked fine. So I put it back in my car and played it normally for the next day. Then tonight I got the message again.

So is it the cable? If so, where do I get new cables?