Dell PowerEdge 750 - Manual (Page 20)

Table 2-2. Back-Panel LED Codes
System Messages
System messages appear on the screen to notify you of a possible problem with the system. Table 2 -3 lists the system messages that can occur and the
probable cause and corrective action for each message.
Table 2-3. System Messages
LED
Indicator Normal Operation Error Condition
Status Off The system is off.
Blue The system is operating normally.
Blue blinking The system is identifying itself due to the pressing of the identification button.
NOTE: Systems management software causes the indicator to blink to identify
the system.
Amber blinking Indicates a fault with the system.
NIC activity Flashing amber indicates network data is being sent or
received.
When this indicator is off at the same time that the link indicator is off, the
network adapter is not connected to the network.
NIC link Steady green indicates that the network adapter is
connected to a valid link partner on the network.
When this indicator is off at the same time that the activity indicator is off, the
network adapter is not connected to the network.
NOTE: If you receive a system message that is not listed in Table 2 -3 , check the documentation for the application that is running when the message
appears or the operating system's documentation for an explanation of the message and recommended action.
Message Causes Corrective Actions
Address mark not found
Faulty diskette, CD, or hard-
drive subsystem; defective
system board.
Ensure that the diskette, CD, and hard drive cables are properly connected. See
" Troubleshooting the Diskette Drive ," " Troubleshooting the CD Drive ," " Troubleshooting a SATA
Hard Drive ," or " Troubleshooting a SCSI Hard Drive ," in "Troubleshooting Your System" for the
appropriate drive(s) installed. If the problem persists, the system board may be defective. See
"
Troubleshooting the System Board ."
Alert! Cover was
previously removed!
The chassis has been
opened.
Information only.
Alert! CPU fan was not
detected.
Alert! Memory fan was not
detected.
Alert! PCI fan was not
detected.
Specified fan is faulty or the
fan assembly is not installed
correctly.
Ensure that the fan assembly is properly installed. See " Troubleshooting a Fan ," in
"Troubleshooting Your System."
Unsupported or faulty Ensure that the memory modules are properly populated. See " Memory Module Installation