What time is it? What day is it? What hard drive is this?

Every time you start your computer, it complains that the configuration is invalid and the date and time is reset back to defaults. What is the most likely cause of this issue?

A) The BIOS needs to be upgraded

B) The power supply is faulty

C) The computer’s battery needs to be replaced

D) The motherboard is faulty

E) The computer is only pretending not to know what day it is

The answer: C) The computer’s battery needs to be replaced

The battery on the motherboard of the computer maintains the configuration when the system is disconnected from normal power sources. If the battery loses its charge, the CMOS configuration will not be maintained and the configuration will need to be rebuilt each time the system boots.

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.