Figure 26. Location Of Diagnostic Leds On Server Board; Table 41. Post Progress Code Led Example - Intel S3000PT - Server Board Motherboard Specification

Error Reporting and Handling
Each POST code is represented by a combination of colors from the four LEDs. The LEDs are
capable of displaying three colors: green, red, and amber. The POST codes are divided into an
upper nibble and a lower nibble. Each bit in the upper nibble is represented by a red LED and
each bit in the lower nibble is represented by a green LED. If both bits are set in the upper and
lower nibbles then both red and green LEDs are lit, resulting in an amber color. If both bits are
clear, then the LED is off.
In the below example, the BIOS sends a value of ACh to the diagnostic LED decoder. The
LEDs are decoded as follows:
Red bits = 1010b = Ah
Green bits = 1100b = Ch
Since the red bits correspond to the upper nibble and the green bits correspond to the lower
nibble, the two are concatenated to be ACh.
LEDs Red
ACh 1
Result Amber
MSB

Figure 26. Location of Diagnostic LEDs on Server Board

Revision 1.3

Table 41. POST Progress Code LED Example

8h 4h
Green Red
1 0
Green
Intel® Server Board S3000PT TPS
2h
Green Red
1 1 0
Red
1h
Green Red Green
0 0
Off
LSB
59