Acer Altos R920 Series - Manual (Page 117)

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BIOS overview
The Aptio Setup Utility 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. You will need to run this utility under the following conditions.
• When changing the system configuration settings
• When redefining the communication ports to prevent any conflicts
• When changing the password or making other changes to the
security settings
• 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.
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.
Note: Aptio Setup Utility will be simply referred to as “BIOS
setup”, “Setup”, “System BIOS” or “Setup Utility” in this guide.
The screenshots used in this guide display default system values.
These values may not be the same as those found in the system.