The CMOS remembers the time and date settings of the computer, and also remembers the Hardware settings.
CMOS settings are altered by the BIOS program while in setup mode.
CMOS or BIOS configuration settings
boot order
boot order
If the CMOS battery dies you lose the settings that are held in the BIOS (Basic Input Output System). These include settings such as date/time, boot order,etc.
CMOS battery
Data stored in CMOS can be altered using a CMOS editor program. CMOS commonly stores the computer's BIOS and its content can be changed using the inbuilt BIOS settings utility.
Current date and time
Its is the button battery that stores the BIOS settings for your computer.
Data stored in CMOS can be altered using a CMOS editor program. CMOS commonly stores the computer's BIOS and its content can be changed using the inbuilt BIOS settings utility.
There is a small battery that powers the CMOS chip.
You can press the Delete or F2 key to get into bios and then you can reset the settings or you can reset CMOS. This guide shows you how to reset CMOS - http://www.eteknix.com/how-s/how-reset-cmos-122/