POST and BIOS Setup Utilities
You can run BIOS Setup with or without an operating system being present. BIOS Setup
stores most of the con guration values in battery-backed CMOS ; the rest of the values are
stored in ash memory. The values take effect when the system is booted. POST
uses these
values to con gure the hardware. If the values and the actual hardware do not agree, POST
generates an error message.
Record your BIOS Setup settings. If default values ever need restoring (after a CMOS clear,
for example), you must run BIOS Setup again. Your record will make this much easier.
If BIOS Setup Is Inaccessible
If you are not able to access BIOS Setup, you might need to clear the CMOS
clear CMOS, either of two methods can be used:
Press the reset button and hold it down for four seconds or more, and then, while holding
the reset button down, press the power button. Release both buttons at the same time
Move the Clear CMOS jumper found on the configuration jumper block on the base-
You can enter and start Setup under several conditions:
When you turn on the server, after POST completes the memory test
When you have moved the CMOS jumper on the server board to the “Clear CMOS”
position (enabled). For instructions on moving the jumper, see Chapter 6, CMOS
In these two conditions, after rebooting, you will see this prompt:
Press <F2> to enter SETUP
In a third condition, when CMOS/NVRAM
has been corrupted, you will see other mes-
sages but not the <F2> prompt:
Warning: CMOS checksum invalid
Warning: CMOS time and date not set
In this condition, the BIOS will load default values for CMOS and attempt to boot.
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