We have a 2003 Domain Controller that is stuck at Preparing network connections. It was having DNS errors and the onsite "IT" person thought it was a good idea to remove dns and reinstall. Now this is a single DC running DNS, DHCP, File Server and Print Server and on top of that is a hospital. I cannot get it to boot past the Preparing network connections screen. I have tried to use erd commander 2005 to see if I can figure out whats going on but I cant get it to choose the OS so all tests and queries fails from it. I am at a loss as to what to try next. I have tried safemode safemode with networking, last known good configuration, I did get into DSR mode and verified that it was pointing to itself for DNS and also set it up as a standard primary DNS server to try and get away from any AD failures. I do see the 4015 error a lot on the server but no real reason for why it hangs on boot.