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The eight diagnostic LEDs are divided into two groups. LEDs from CR15-CR12 comprise one group, and LEDs from CR11-CR8 comprise the other group. The two groups represent the two digits of the hex code. The CR15-CR12 group stands for the first digit and the CR11-CR8 group stands for the second.

CR15

 

CR14

 

CR13

 

CR12

 

CR11

 

CR10

 

CR9

 

CR8

In determining the code, Off = 0 and On = 1. Based on this, you can determine the corresponding hex code. Then, by checking “POST code checkpoints” on page 73, “Bootblock initialization code checkpoints” on page 76, “Bootblock recovery code checkpoints” on page 76, “DIM code checkpoints” on page 77, and “ACPI runtime checkpoints” on page 78, you can find out where an error is taking place.

For example, if a hex code of 0B is indicated, you can detemine that the server cannot detect the PS/2 mouse. You can then take measures, such as reinserting the mouse, to solve the problem.

All LEDs are cleared and restored to normal status after the server is power cycled.

POST code checkpoints

The following table shows the checkpoints, LED codes, and task description of events that may occur during the POST portion of the BIOS:

Check Description point

03Disable NMI, Parity, video for EGA, and DMA controllers. Initialize BIOS, POST, Runtime data area. Also initialize BIOS modules on POST entry and GPNV area. Initialized CMOS as mentioned in the Kernel Variable “wCMOSFlags.”

04Check CMOS diagnostic byte to determine if battery power is OK and CMOS checksum is OK. Verify CMOS checksum manually by reading storage area. If the CMOS checksum is bad, update CMOS with power-on default values and clear passwords. Initialize status register A.

Initialize data variables that are based on CMOS setup questions. Initialize both the 8259 compatible PICs in the system.

05Initialize the interrupt controller in hardware (generally PIC) and interrupt vector table.

73