Event ID - 455

Event Id455
SourceNTDS General
DescriptionNTDS (308) Error -1811 occurred while opening a log file %4.
Event InformationAn unplanned loss of power (such as a rolling power outage) on a running Windows 2000 DC can prevent Active Directory from reading either the NTDS.DIT or log files on next boot. This problem is characterized by a series of events.  Event ID 455, 1168 from NTDS General and Event ID 100 from NTDS ISAM.
The 1811 error in the Event IDs 455 and 1168 map to jet errors that indicate that the specified file is missing or unreadable.

Following link to a Microsoft article will give  more information about this event.
Reference LinksEvent 1168: Windows 2000 DCs Unable to Boot into Active Directory

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