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POST Codes
Error Messages and Error Codes
The system BIOS displays error messages on the video screen. Prior to video initialization, beep
codes inform the user of errors. POST error codes are logged in the event log. The BIOS displays
POST error codes on the video monitor.
POST LEDs
Eight light emitting diodes are used to indicate the raw binary output of port 80 values. These LEDs
are arranged such that a direct correlation to the binary equivalent can easily be read by the user.
Table 21 shows the correlation of port 80 POST code bit to LED reference designator. This table
also provides a snapshot of the LEDS on the board.
Table 21.
Port 80 POST Code LED Definition
Port 80 POST Code Bit
7 (MSB)
6
5
4
3
2
1
0 (LSB)
POST Progress Codes and Messages
The BIOS outputs the current boot progress on the POST progress LEDs.
Table 22.
POST Progress Codes and Messages
Progress Code
Host Processor
0x10
0x11
0x12
0x13
Chipset
0x21
243
LED Reference Designator
DS7D2
DS7D3
DS7D4
DS7D5
DS7D6
DS7E1
DS7E2
DS7E3
Progress Code Definition
Power-on initialization of the host processor (Boot Strap Processor)
Host processor cache initialization (including AP)
Starting Application processor initialization
SMM initialization
Initializing a chipset component
Port 80 POST LED Locations
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Troubleshooting
