Asus A555B, E-Manual, Page: 64 / 116

64 Notebook PC E-Manual
The Power-On Self-Test (POST)
The POST (Power-On Self-Test) is a series of software-controlled
diagnostic tests that run when you turn on or restart your Notebook PC.
The software that controls the POST is installed as a permanent part of
the Notebook PC’s architecture.
Using POST to access BIOS and Troubleshoot
During POST, you can access the BIOS settings or run troubleshooting
options using the function keys of your Notebook PC. You may refer to
the following information for more details.
Accessing BIOS
Restart your Notebook PC then press during POST.
BIOS
The BIOS (Basic Input and Output System) stores system hardware
settings that are needed for system startup in the Notebook PC.
The default BIOS settings apply to most conditions of your Notebook
PC. Do not change the default BIOS settings except in the following
circumstances:
• An error message appears onscreen during system bootup and
requests you to run the BIOS Setup.
• You have installed a new system component that requires further
BIOS settings or updates.
WARNING! Using inappropriate BIOS settings may result to system
instability or boot failure. We strongly recommend that you change the
BIOS settings only with the help of a trained service personnel.