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The following table describes each POST code, listed in the order in which they are generated. POST codes appear at the bottom right of the BIOS screen as a four-digit string that is a combination of two-digit output from primary I/O port 80 and two-digit output from secondary I/O port 81. In the POST checkpoint codes listed in this section, the first two digits are from port 81 and the last two digits are from port 80.
The Response column describes the action taken by the system on encountering the corresponding error. The actions are:
Warning or Not an Error: The message is displayed on the screen. An error record is logged to the system event log (SEL) for a hardware component. The system continues booting with a degraded state. The user might want to replace the component.
Pause: The message is displayed on the screen, an error is logged to the SEL, and user input is required to continue. The user can take immediate corrective action or choose to continue booting.
Halt: The message is displayed on the screen, an error is logged to the SEL, and the system cannot boot unless the error is resolved. The user needs to replace the faulty part and restart the system.
Table 16 Checkpoint Ranges