Table 2-6. NIC Indicator CodesSystem MessagesSystem messages alert you to a possible operating system problem or to a conflict between the software and hardware. Table 2-7 lists the system errormessages that can occur and the probable cause for each message.Table 2-7. System MessagesIndicator Indicator CodeLink and activity indicators are off. The NIC is not connected to the network.Link indicator is green. The NIC is connected to a valid link partner on the network.Activity indicator is amber blinking. Network data is being sent or received.NOTE: If you receive a system message that is not listed in Table 2-7, see the documentation for the application that is running when the messageappears and/or the operating system documentation for an explanation of the message and recommended action.Message Causes Corrective ActionsAddress mark not foundFaulty CD drive, diskette drive, or hard-drive; faultysystem board.See "Troubleshooting the Diskette Drive," "Troubleshooting a CDDrive," and "Troubleshooting Hard Drives" in "Troubleshooting YourSystem."Alert! Back system fan wasnot detected.Specified fan is missing, faulty, or improperlyinstalled.See "Troubleshooting System Cooling" in "Troubleshooting YourSystem."Alert! CPU n fan was notdetected.Alert! Front system fan wasnot detected.Alert! Cover was previouslyremoved!The chassis has been opened. Information only.Alert! Previous back systemfan failure.Specified fan failed before last system startup (seeFigure 5-5 to identify the fans).Information only.Alert! Previous CPU n fanfailure.Alert! Previous front systemfan failure.Alert! Previous voltagefailure.Power supply failed before last system startup. Information only.Alert! Processor thermalprobe failure detected.Microprocessor fan is missing, faulty, or improperlyinstalled.See "Troubleshooting System Cooling" in "Troubleshooting YourSystem."Alert! Unsupported memory orincomplete sets in theFaulty memory module(s). Ensure that all memory modules are properly installed. If theproblem persists, see "Troubleshooting System Memory" in"Troubleshooting Your System."