Hello, My GF has a 12" PB with Panther on it. It is that last generation PB. Lately when using it on battery power only (with a fully charged Apple replacement battery) a semi transparent screen pops up and say that the computer must restart hold down the power button to restart. It says this in three or four different languages. The kicker is this turns out to be a never ending cycle, unless I pull the battery out reinsert it and plug the PB into the wall. We absolutely love this unit it is the prefered lappy in the house. Even over the MBP and the MB. Thanks so much for any and all help.