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The reason that causes your BIOS to reset to its defaults is a dead battery. Because CMOS (BIOS settings) is a volatile form of memory, the memory chip needs a constant power source, even when the computer is off. To supply this, there is a coin battery located directly on the motherboard. Simply replace this with the exact same kind and you shouldn't have any more problems.

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Q: What should be done if BIOS settings are set to default whenever you boot your system?
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