Dell 745N manual System Messages, Back-Panel LED Codes LED Indicator LED States Description

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Table 2-2. Back-Panel LED Codes

LED Indicator	LED States	Description
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 link/activity	Off	The network adapter is not connected to
		the network.
	Green	The network adapter has established a
		link to the network
	Flashing green	Data is being transmitted.

System Messages

System messages appear on the screen during power-on self test (POST) 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.

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.

Table 2-3. System Messages

Message	Causes	Corrective Actions
Address mark not found	Faulty hard-drive subsystem; defective	Ensure that the hard drive cables are
	system board.	properly connected. See
		"Troubleshooting Hard Drives" 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	The chassis has been opened.	Information only.
previously removed!

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Indicators, Messages, and Codes