A Global Catalog DC dies, and after seizing the roles and rebooting, users (and the administrator) still can't log on to machines. An information message in the FRS log indicates that you need to wait until a check is done of the system volume, upon which the NETLOGON share will be created. We wait.
After waiting forever, try the following instead: 1. Stop the File Replication service (on the DC) 2. Start Registry Editor 3. Navigate to: HKLM\SYSTEM\CurrentControlSet\Services\NtFrs\Parameters\Backup/Restore\Process at Startup\ 4. Select the 'Burlap' key, and on the Edit menu, click DWORD, click Hex, type D2, and then click OK. 5. Close the Registry Editor 6. Restart the File Replication service