Can anyoneprovide any insight as to the meaning ofWHEA-Logger EventID:21 messages in the Windows 2008 System Event log? I've found several postsdiscussing EventID:19 butvirtually nothing related to EventID: 21.I'm suspecting a memory problem and plan to run Memtest as soon as I can have the system down for several hours.Thanks for any help,ToddEvent logdetails: Log Name: SystemSource: Microsoft-Windows-WHEA-LoggerDate: 9/11/2008 5:49:26 PMEvent ID: 21Task Category: NoneLevel: WarningKeywords: User: LOCAL SERVICEComputer: Server1.domain.localDescription:A corrected hardware error occurred. Error Source: Corrected Machine Check Error Type: 48009992 Processor ID Valid: YesProcessor ID: 0x0Bank Number: 4Event Xml:<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="Microsoft-Windows-WHEA-Logger" Guid="{c26c4f3c-3f66-4e99-8f8a-39405cfed220}" /> <EventID>21</EventID> <Version>0</Version> <Level>3</Level> <Task>0</Task> <Opcode>0</Opcode> <Keywords>0x8000000000000000</Keywords> <TimeCreated SystemTime="2008-09-12T00:49:26.965Z" /> <EventRecordID>9748</EventRecordID> <Correlation ActivityID="{E1E9562F-32CB-4EE4-9C3B-B1CC8A0C091E}" /> <Execution ProcessID="1276" ThreadID="1692" /> <Channel>System</Channel> <Computer>Server1.domain.local</Computer> <Security UserID="S-1-5-19" /> </System> <EventData> <Data Name="ApicIdValid">1</Data> <Data Name="ApicId">0x0</Data> <Data Name="MCABank">4</Data> <Data Name="MciStat">0xdc48c00193080813</Data> <Data Name="MciAddr">0x14c9e7290</Data> <Data Name="MciMisc">0xc00b0fff00000000</Data> <Data Name="ErrorType">48009992</Data> <Data Name="Length">1730</Data> <Data Name="RawData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ata> </EventData></Event>

Hello, I would double check if you are running RTM version of Windows Server 2008. Additionally, I would highly suggest that you also contact the devices manufacturers to see if these devices are compatible with Windows Server 2008, especially if you are running 64-bit version of Windows Server 2008. Also, see if they have any updates on the devices. Some common problems to similar errors can usually be fixed after updating the BIOS or some device drivers. So, besides checking the memory, please also check other hardware devices. Best regards,Chang Yin