Acer Altos G300 - Manual (Page 89)

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The optimal settings default values are quite demanding and your
system might not function properly if you are using slower memory
chips or other kinds of low-performance components.
Auto Configuration with Fail-Safe Settings
If you highlight this item and press Enter, a dialog box asks if you want
to install fail-safe settings for all the items in the Setup utility. Press
the Y key to indicate Yes, and then press Enter to install the fail-safe
settings.
The fail-safe settings default values are not demanding so a system
should be able to operate with the fails safe settings even if it is
installed with slower memory chips or other kinds of low-performance
components.