![]() In any of those reasons, the values of the BIOS will be corrupted and no longer the boot process takes place. Some of them are Sudden power loss while updating the BIOS, Incorrect BIOS update and Malware attacks. The boot values can be corrupted due to many reasons. The values on the BIOS assists the system to boot. Reset BIOS The other option you may use to resolve this issue is by resetting the BIOS. After the end of this guide, you will know the solutions and finally repair 502 errors in the CMOS checksum which invalidates booting. In this article I will be guiding you on how to fix CMOS checksum error | invalid 502. Due to any of those reasons the computer will not only refuse to boot it will also show wrong times since the computer's internal clock depends on the CMOS battery for its power. The reason for this may be either the CMOS values are corrupted or the CMOS chip is malfunctioned/dead. If those numbers does not match it will end up showing a black screen with the error, '' CMOS checksum error - Defaults loaded '' '' CMOS checksum is bad '' '' CMOS checksum is invalid '' '' CMOS Reset ( 502 ) '' No matter how many you restart the computer you will get the same error message. Next time when a computer is turned on, the CMOS will check these set of numbers with the numbers that BIOS generated. Generally when a computer is turned off, the CMOS will record a set of numbers. Therefore whatever the change you make on the BIOS is recorded in the CMOS. ![]() It also supplies power to the BIOS even when the computer is turned off. The basic function of this chip is to store settings and informations that is related to the BIOS. Complementary Metal Oxide Semiconductor ( CMOS) is a semiconductor chip which is present on the motherboard of the computer.
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