Change your cmos battery

If your computer is losing its time or date settings, or you are receiving a message CMOS Read Error, CMOS checksum error, or CMOS Battery Failure.

How to resolve this problems

• First attempt to leave the computer on for 24 hours. In some cases this can charge the battery and resolve your issue.
• This often resolves CMOS battery related issues when a computer has been left off for several months.
• If it doesn’t work then change your computers cmos battery which is present on motherboard as shown in figure below. Changing cmos battery is really easy, take out old battery from socket with help of pin and place new one , just like old.

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