What happens during post?

Which of these would commonly be tested during POST? Pick two.

A) Operational video adapter

B) Hard drive read access times

C) Keyboard connection

D) USB power output levels

E) Wearing the same colored socks

The answer: A) Operational video adapter and C) Keyboard connection

The power on self-test (POST) process provides a basic hardware diagnostic that confirms that the minimum necessary hardware is available before starting the computer. If RAM is missing, the video adapter isn’t working, or the keyboard isn’t connected, you’ll get an error message and the computer will stop the boot process before loading the operating system. Detailed diagnostics, such as hard drive access times and USB power levels aren’t part of the POST process; you’ll need some additional diagnostics software to check for that detailed information.

Want to know more? Watch “BIOS and CMOS.”

We rely on the BIOS to test our computer and start our operating systems, but what is really happening under the surface? In this module, you’ll learn about the BIOS works and we’ll demonstrate the basics of starting and configuring BIOS settings.