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Toshiba 3480TC CMOS reset

By r.mail ·
My Toshiba portege 3480CT gives a "Bad check sum (CMOS) error after lying unused for a while. I understand this maybe due to the CMOS battery going flat.

My question is how do I reset the CMOS to factory settings? If I can't do this there's no point in my replacing the battery.

Any suggestions gratefully received.
Many TIA

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