Acer TravelMate 4750 - Manual (Page 63)

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BIOS utility
The BIOS utility is a hardware configuration program built into your 
computer's BIOS.
Your computer is already properly configured and optimized, and you do not
need to run this utility. However, if you encounter configuration problems, you
may need to run it.
To activate the BIOS utility, press during the POST while the notebook PC
logo is being displayed.
Boot sequence
To set the boot sequence in the BIOS utility, activate the BIOS utility, then select
Boot from the categories listed at the top of the screen.
Enable disk-to-disk recovery
To enable disk-to-disk recovery (hard disk recovery), activate the BIOS utility,
then select Main from the categories listed at the top of the screen. Find D2D
Recovery at the bottom of the screen and use the and keys to set this
value to Enabled.
Password
To set a password on boot, activate the BIOS utility, then select Security from
the categories listed at the top of the screen. Find Password on boot: and use
the and keys to enable this feature.