Sometimes it could be that the BIOS did not change the settings previously after you switch off your computer and the checksum error occured because of that. Common problem related to this is the BIOS battery ran out so the value in the CMOS memory is not kept, so the checksum error is bound to occur. ![]() If the integer values match then the computer beeps and begins regular operation. The checksum error will normally force the BIOS to return to default settings since that is the most reliable thing to fall back on. To be safe the computer will normally return to default settings since it has no idea what the original settings were, the integer value doesn't match that means the settings are not correct from the previous stored setting. ![]() Upon booting up the BIOS will be going through all the settings, it will add up all the values of the settings and then compare with the unique integer stored in the CMOS's memory, if the number doesn't match then a checksum error occurs. Each setting has a designated number whether on or off, on maybe equals 14 and off means 24(these will be different upon the settings as well), these designated values add up to a unique(no other number like it can be generated unless certain conditions are met) integer which is stored in the BIOS. The BIOS keeps a set integer which it compares with while it is going through the settings, this is stored in the CMOS memory after a change in the BIOS or when you turn off the computer. ![]() But to answer your question about a checksum error.Ī checksum error is or shows that upon boot up settings which were set previously have now changed.
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