Solving the CMOS checksum error

If when you start your computer you see any of these messages:

- CMOS checksum error - Defaults loaded
- CMOS Battery Low
- CMOS Battery State Low
- CMOS Date/Time Not Set
- CMOS Checksum Bad

And you have to manually set the clock on each reboot, changes are that your battery ran out.

Here are the steps to follow to solve the problem:

1. Turn off your computer, make sure the cables are unplugged.
2. Check if the battery is a removable one (some motheboards have it soldered).
3. If it's removable, buy a CR2032 one.
(If you are curious, "C" indicates the electrochemical system used, in this case Lithium (manganese dioxide), the "R" is for round, 20mm diameter and 3.2mm height).
4. Before replacing the battery, start your computer and enter the BIOS setup (usually by pressing DEL, F1 or F8), if the settings are still there, take note of them (they might be already gone, if the battery is depleted).
5. Open the computer case (remember to have it turned off),
to avoid any problem if you touch other component, use an anti-static wrist wrap.
Locate the battery, and gently replace it.
6. Restart your computer, enter the BIOS setup and set the right time and date, and any BIOS settings you saved.
7. Save the settings and reboot.

Remember to dispose the old battery on some local recycling center (take care of the environment).

And this is for your information only, do it at your own risk.

[Cocoaxel]

it said to press f1 to load cmos default value and f10 to bios setup options why

[MuhammadMusthafaD]

I replaced to new battery but also it says coms bad ?.. Why ans me

[panthalassa]

Hi! It says "Warning! Chassis has been opened
Press F1 Continue
Press Del Enter BIOS set up"
Any ideas?

[shiro]

thnx for the tip! i actually only needed to put it in better ! can i ask u something else do you know if bad hardware like SSD card readers or dvd players e.t.c. can be the cause of random shutdowns? i have this problem for a couple of years now, it wasn't to bad when it first happened only a system crash once in a while thought i had a system overload or something but lately it keeps doing all the time ! sometimes after 4 or 5 shutdowns pc works with no interruption! thnx for the help!

[zackvasquez]

hey man my headset and ethernet cable are not detected but my usb ports work coz i can use my webcam, keyboard and mouse. but i cant connect to the internet and headset doesnt work either and it also says cmos checksum error when I start computer. please help

[prembarot]

i replaced but it work for only 1 day and in 2nd day i replaced it with new one bt i cant get solution it work only for 2 days what is the problem in my pc?

[lorenc-gaming]

what about laptop checksum error how to fix plzz help

[twicegamin]

getting checksum error. is this specified Cell I use or Can I use any other Brand ?