79Power-On Self-Test (POST) Error MessageThe POST error message index lists the error message and their possible causes. The most likely cause islisted first.NOTE: Perform the FRU replacement or actions in the sequence shown in FRU/Action column, if the FRUreplacement does not solve the problem, put the original part back in the computer. Do not replace anon-defective FRU.This index can also help you determine the next possible FRU to be replaced when servicing a computer.If the symptom is not listed, see “Undetermined Problems” on page 86.The following lists the error messages that the BIOS displays on the screen and the error symptoms classifiedby function.NOTE: Most of the error messages occur during POST. Some of them display information about a hardwaredevice, e.g., the amount of memory installed. Others may indicate a problem with a device, such as theway it has been configured.NOTE: If the system fails after you make changes in the BIOS Setup Utility menus, reset the computer, enterSetup and install Setup defaults or correct the error.Index of Error MessagesError Message ListError Messages FRU/Action in SequenceFailure Fixed Disk Reconnect hard disk drive connector.“Load Default Settings” in BIOS Setup Utility.Hard disk driveMain BoardStuck Key see Keyboard or Auxiliary Input Device Check” on page 76 .Keyboard error see Keyboard or Auxiliary Input Device Check” on page 76.Keyboard Controller Failed see Keyboard or Auxiliary Input Device Check” on page 76.Keyboard locked - Unlock key switch Unlock external keyboardMonitor type does not match CMOS - RunSetupRun “Load Default Settings” in BIOS Setup Utility.Shadow RAM Failed at offset: nnnn BIOS ROMMain BoardSystem RAM Failed at offset: nnnn DIMMMain BoardExtended RAM Failed at offset: nnnn DIMMMain BoardSystem battery is dead - Replace and runSetupReplace RTC battery and Run BIOS Setup Utility to reconfiguresystem time, then reboot system.System CMOS checksum bad - Defaultconfiguration usedRTC batteryRun BIOS Setup Utility to reconfigure system time, then rebootsystem.System timer error RTC batteryRun BIOS Setup Utility to reconfigure system time, then rebootsystem.Main BoardReal time clock error RTC batteryRun BIOS Setup Utility to reconfigure system time, then rebootsystem.Main Board