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## 7.3 Default BIOS Power-On Self-Test (POST) Events

At system startup, the BIOS performs a power-on self-test that checks the hardware on the server to ensure that all components are present and functioning properly. BIOS POST Events identifies the events that can occur during BIOS POST, as well as specifies whether these events can prevent the host from powering-on.

Table 7-1 BIOS POST Events

Event | Cause | Boot Continues on Host?
--- | --- | ---
User password violation | Attempt to enter password fails three times | No
Setup password violation | Attempt to enter password fails three times | No
Correctable ECC | Correctable ECC (error correction code) error detected | Does not apply
Uncorrectable ECC | Uncorrectable ECC error detected | Does not apply
No system memory | No physical memory detected in the system | No
No usable system memory | All installed memory has experienced an unrecoverable failure | No
Hard disk controller failure | No disk controller found | Yes
Keyboard failure | Keyboard cannot be initialized | Yes
Boot media failure | No removable boot media is found | Yes
No video device | No video controller is found | No
Firmware (BIOS) ROM corruption | BIOS checksum fails and the boot block is not corrupted | No
CMOS checksum bad | Checksum failure | Yes
CMOS time and data error | Real-time clock (RTC) is invalid | Yes
CMOS battery low | CMOS battery is low | Yes
System restart | System boot initiated | Yes
Initiated by hard reset | Boot process started by hard reset | Yes
Memory initialization | Memory sizing is occurring, system firmware progress | Does not apply
Secondary processor initialization | Secondary CPU initialization, system firmware progress | Does not apply
Initiated by warm reset | Boot process started by warm reset | Does not apply
Embedded controller management | Management controller initialization | Does not apply
Video initialization | When BIOS initializes video | Does not apply
Keyboard controller initialization | When BIOS initializes keyboard | Does not apply
Option ROM initialization | BIOS initializes Option ROMs, system firmware progress | Does not apply
Option ROM space exhausted | BIOS cannot copy an option to the memory | Yes
User initiated system setup | User initiated access to BIOS Setup Utility, system firmware progress | Does not apply
User initiated boot to OS | System boot initiated, system firmware progress | Does not apply
No bootable media | Nothing to boot from | No
PXE server not found | Boot error - PXE server not found F12 key was pressed but BIOS fails to boot from PXE server | No
ACPI Power state | Soft-off power applied | Does not apply
PCI resources exhausted | BIOS cannot allocate I/O or MMIO address resources requested by a device | Yes

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