If your computer is abruptly powered off, it may have shut down before having the chance to write information to the BIOS memory. Microsoft Windows requires your device to shut down prior to the removal of power. Power surges can sometimes lead to your computer failing to boot into Windows.If your BIOS is somehow damaged or corrupted it will cause a value mismatch between your BIOS and CMOS, leading to your BIOS checksum error. If you made any recent changes to your BIOS, there is a chance that these settings may not have saved.The CMOS battery has an expected life span of three years, but it can discharge before that, leading to your computer failing to boot into Windows. The most likely reason why you are seeing the CMOS checksum error is a faulty CMOS battery.There are primarily three reasons why you may be seeing the checksum error on your device. In case of a mismatch between these two values, you will see a CMOS checksum error. Every time your computer loads, this value is crosschecked against the CMOS memory value. To guard the BIOS software, the CMOS memory stores a specific value on itself. What Causes The System CMOS Checksum Bad? You will see the BIOS CMOS checksum error when the computer fails to read the said information from your nonvolatile BIOS memory. When you boot back into Windows, your computer will read the previous state in which your device was from the BIOS CMOS RAM. These settings are stored on your hard drive instead, these are stored on a separate nonvolatile CMOS RAM chip.Ī Complementary metal-oxide-semiconductor (CMOS) battery maintains the BIOS memory even when your PC shuts down. In addition to booting up your computer, BIOS also maintains other settings for the hardware, like boot priorities, time and date, speeds, voltages, etc.
#Cmos checksum bad software#
The software on your motherboard is the BIOS (Basic Input Output System).
#Cmos checksum bad how to#
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