If you have changed the system setup by mistake, you can restore the default settings.
After opening the system setup screen, use the arrow keys to move to Exit.
Use the arrow keys to select Load Optimal Defaults and press [Enter].
When the following message appears, select [Yes] and press [Enter]. The settings will be reset to the factory default.
To save the changes in system setup, press [F10].
When the following message appears, select [Yes] and press [Enter]. The computer will restart automatically.
You may also press [F9] to use Load Optimal Defaults.