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The CMOS (BIOS) battery keeps the computer'a comfiguration and the Date & Time settings in the CMOS (BIOS) chip in its memory. When the CMOS (BIOS) battery is flat these configuration information is lost. Replace the CMOS battery with a new one, in most cases this battery is a lithium 3 volt battery type CR2032 and it is coin size battery 18mm in dia.(check it to make sure the type of battery is installed on your motherboard). When you replace this battery then go into the BIOS and set the Date & Time etc.
This error occurs when the BIOS battery is flat. Replace the BIOS battery, most motherboards use a lithium battery type CR2032, this is a coin size battery. Check the BIOS battery type used on your motherboard before you purchase the battery. After replacing the battery go to the BIOS setting and set the Date & Time etc. and you will not have this CMOS error.
The computer is asking you to go into the BIOS to fix (probably) the Date and Time because it is wrong or some other setting is wrong or corrupted. This is usually cause by a flat BIOS battery. Replace the BIOS battery (this battery may be a coin size lithium battery type CR2030) and then go to the BIOS configuration and set the Date & Time etc.
A bad checksum can be caused by a flat or near flat BIOS battery. Replace the battery and set the date and time.
Also set the BIOS to the default setup, ie go to reload default settings, or remove the BIOS battery for 1/2 hour the insert the battery and set the Date and Time.