7 Secret Settings to Inspect Your Computer Performance After Malware Removal

The computer will also display CMOS battery failure, CMOS read error, or CMOS checksum error, etc. If this happens, you need to switch on your computer and leave it on for a day.

The CMOS settings like date and time get changed. In some instances, the date and time get set to factory default. For example, your computer date will be set to factory settings, something like 12/01/2008. The CMOS battery is a small battery fitted on the motherboard of your computer.

It keeps on showing error when connecting to the internet. You need to check whether time and date are correct. If the date and time are wrong, try correcting.

Cmos Checksum Bad – Date Time Not Set

If the computer is not showing the errors after rebooting, the CMOS battery is charging. Otherwise, you need to replace the CMOS battery. You may not be able to connect to the internet.

Then, check again; if the computer is still not connecting to the internet, you need to replace the CMOS battery. If the voltage drops between certain levels, your computer loses the memory.

I am able to get it to boot again if I remove the PCIE graphics card and use the internal one.
I have tried a little more and I am able to boot into failsafe mode and recovery mode in Windows.
Then I had a checksum error, and the cpu does not load beyond BIOS.
The change of battery did not help much still the same error (removed the old one yesterday and changed the clear CMOS jumper to clear and left it like that over night).
Though I am still not able to get rid of the CMOS Checksum Bad error.

When the battery is dead, the CMOS can’t store information anymore. One possibility is that you use different RAM modules in your computer. Also try to configure the BIOS for not perform a parity check.

On the original 5150 IBM PC introduced in 1981, it did not have a CMOS – BIOS settings were controlled by DIP switches on the motherboard. One of the more common causes of a checksum error is also the simplest to solve. The battery that powers the CMOS is a watch battery, and it can run other out of power.

Way 2: Reset The Basic Input/output System (Bios)

You need to use the computer regularly to extend the life of the CMOS battery. The computer power supply increases the availability of a standby current and hence increases the life of the battery.

Set the jumper to the “clear” position, power on your computer, turn it off again, set the jumper to the original position – and you’re done. A POST error message will only display on screen if the computer is capable of booting this far. If the POST detects an error before this point, a beep code or POST code will be generated instead. Use the multimeter to check the voltage of the battery (use a digital multimeter). If the voltage is less than 3V, your computer will not remember the CMOS settings, so it is time to replace the old battery with the new CMOS battery.