Hi guys, I wonder if you can help me with an issue my Dad is having with his MacBook Pro. So today he shut the MacBook down, but when he switched it on again it booted fine, right through the chime and Apple logo, but when it got to the login screen it switched off. The power adaptor was connected. He has been having problems with the battery, with it not holding a charge. Do you think it has anything to with it? Thanks for your help, Ams.