My 15" Macbook pro 2.33 core2duo justs shuts off when the power cord is disconnected. It says the battery is fully charged, and all the LED's on the battery iteself turn green, however as soon as I remove the power cord, the unit shuts off completely, and does not start until the power cord is re-inserted. I have tried some of the tips on the apple support site, including removing both the battery and ac and holding down power for five seconds, and I have also tried installing the battery update 1.2 to no avail. Any help would be greatly appreciated!