-Occasionally, the ring on the power adaptor (the one that glows orange when it's charging, and green when the battery is full, or there's no battery) doesn't light up.
-And occasionally, it does.
-When it doesn't, lifting the front of the laptop and knocking on the the area to the right of the mousepad (above the battery, note!) will cause the ring to light up, either as orange, green or interestingly, red.
-The computer DOES know that the power adaptor's plugged in. However, it will not calculate (it stays with "calculating" the time remaining, if the ring is off. Nor does it actually charge the battery (left it on all night, battery was at half when I woke up this morning). However, it keeps the computer running... on AC power, just.. not... charging the battery.
-Tapping the area above the battery doesn't always cause the ring to light up.
-Unplugging it, then plugging it back in will not always make it go back to it's previous behavior. (ie, if it was working fine, then unplugging it and plugging it back in might cause it to malfunction again. Or it'll work properly.)
-It'll take a while to go from off to green to orange, if it ever does. Like, after a minute.
-Sometimes, when it's orange, the time to full charge is around 9 hours. Typically, it's 2 hours.
I'm suspecting the iBook. However, it could be the adaptor... maybe it's not sending out enough power...? But then, why does knocking on the area above the battery change things? And why did it work before I sent my iBook in for repairs?
...oh, and the presence of other Apple products causes both items to function properly. I tried it in our local computer store - no problems whatsoever. Granted, I only tried things once, and sometimes, both will behave perfectly for hours on a time, as long as nothing's changed....