This problem just started yesterday. The iBook battery will not charge nor will the light on the charger show any color when plugged in. The battery time until full charge icon is stuck on "calculating." 1) The charger is fine since I checked it on another iBook. (Light comes on and changes appropriately.) 2) I have multiple batteries so any one individual battery is not the problem. Also it registers the proper charge capacity. 3) I've reset the PMU and it does not help. Any thoughts on what the problem is?