Beep. Beep beep. Beep.

You’ve just returned from a well-deserved vacation. When you start your computer, the display screen remains blank and beeps a few times. Which of these would be the most likely cause of this issue?

A) The monitor is not connected to the computer

B) The network cable is disconnected

C) The POST has failed

D) The power supply has failed

E) The computer is playing some really boring mp3 files

The answer: C) The POST has failed

The Power On Self-Test is the initial hardware check that occurs when a system boots. If a serious error occurs, video is often not displayed and a set of beeps is provided by the BIOS as a diagnostics tool. By referencing the number and length of the beeps from the manufacturer’s documentation, you can determine what part of the POST is failing.

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.