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Taking the CMOS battery out for a few minutes does relatively little, it must be left out for 24 hours or more to have any effect. (I'm a full time computer tech at a service shop, and depending on the make/model of the board, sometimes leaving the battery out will help a fudged BIOS). By leaving the battery out for 24-36 hours, I've revived an Asus A7V333 from a failed flash bios update with that, so maybe it will work for you.
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