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Whenever I start my computer with Windows XP on it, even from hibernating, I have to press F2 so that it loads the default BIOS values.

The other option is pressing F1 to enter setup.

Earlier it used to load automatically, there was no need to press F2.

What's the solution to that problem?

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Sounds like you need to replace your CMOS battery.

How to change it (and if it's even possible) will depend on your specific hardware.

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