IBM 392, 387, 393, 391, 389, 388, 441, 390 manual BMC status LED, POST code diagnostic LEDs

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BMC status LED

This LED indicates the BMC status of your server.

BMC status LED	Color	Description
On	Green	The BMC is not ready.
Off	None	The BMC has no power or fails.
Blinking	Green	The BMC is working.

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POST code diagnostic LEDs

During the system boot process, the BIOS executes several platform configuration processes, each of which is assigned a specific hex POST code number. When each configuration routine is started, the BIOS displays the POST code number through the POST code diagnostic LEDs on the system board. To assist in troubleshooting a system hang during the POST process, the diagnostic LEDs can be used to identify the last POST process executed.

The POST code diagnostic LED #0 (callout 4 ) is the LSB and the POST code diagnostic LED #7 (callout 9 ) is the MSB. If a POST code diagnostic LED is lit, it indicates 1 in the binary numeral system; otherwise, it indicates 0. For example, if POST code diagnostic LEDs 5 , 6 , 9 , and 10 are lit, you can read the number as the following:

POST code diagnostic LED
	9		7		5		3		10		8		6		4
Binary symbol	1	0		1		0		1		0		1		0

The “10101010” indicates a corresponding POST code. For detailed information about the POST code, refer to the Hardware Maintenance Manual. See “Server documentation” on page 2 for information about the Hardware Maintenance Manual.

Note: The POST code diagnostic LEDs and POST error code information are intended for trained service personnel of Lenovo.

Chapter 3. Product overview 51