Elitegroup 223 - Manual (Page 42)

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If this key combination does not shut down the Notebook, you can
reset the Notebook by using the Notebook’s power button. Should the
Notebook lock up for some reason, pressing this button powers the
Notebook off.
Adjusting the Brightness
To adjust the brightness on the LCD screen, press and hold down the
[Fn] key in the lower left hand corner of the keyboard and press the
[F7] key to reduce the brightness or [F8] to increase the brightness.