Thinkpad T21 Charging problems

  Tulli 18:12 15 Nov 2005

I recently installed a bigger hard drive and updated my bios to the latest version on my T21 laptop which was working ok. After updating the bios and booting into XP my battery meter shows unknown charge percentage and if I connect the ac charger it doesnt charge and my battery is 3 months old. I tried updating the bios to an older version but it wont allow me saying there is a error with the power management being disabled. How can I enable power management or fix this problem since I cant find any options for enabling P.M on the bios. HELP

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