Acer Altos R720 Series - Manual (Page 109)

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BIOS setup
BIOS setup is a hardware configuration program built into the system's
Basic Input/Output System (BIOS). Since most systems are already
properly configured and optimized, there is no need to run this utility.
The BIOS setup utility stores basic settings for your server. You will need
to run this utility under the following conditions:
• When changing the system configuration
• When a configuration error is detected by the system and you are
prompted ("Run Setup" message) to make changes to the BIOS
setup
Note: If you repeatedly receive Run Setup messages, the battery
may be bad. In this case, the system cannot retain configuration
values in CMOS. Ask a qualified technician for assistance.
• When redefining the communication ports to prevent any conflicts
• When changing the password or making other changes to the
security settings
BIOS setup loads the configuration values in a battery-backed
nonvolatile memory called CMOS RAM. This memory area is not part of
the system RAM which allows configuration data to be retained when
power is turned off.
Before you run BIOS setup, make sure that you have saved all open
files. The system reboots immediately after you close the setup.