How to enter the BIOS configuration of my Asus K555LN Notebook?

Normal situation:
1. Hold and press the F2 button   then click the power nutton.
2. Release the F2 button     then you shall see the BIOS screen.

Windows 8:
If your Notebook is Windows 8 and you don't know how to enter the BIOS configuration.

If you can't enter the system, please try to press and hold the power button about 5~8 seconds until the Notebook is shut down.

1. Hold and press the F2 button   then click the power nutton.
2. Release the F2 button     and you shall see the BIOS screen as below.