So I have a MBP C2D from early 2007 that up until recently has been running fine. The battery died long ago, so I keep it plugged into the wall which was fine until yesterday. What started happening is my MBP would shut off completely (as if the battery died) and then when I try starting it back up, it would randomly shut off at some point during the boot process (not at one specific point; sometimes it barely makes it into OSX and other times it does not). Anyone know what could be the problem? I have not installed anything new or changed any settings that could effect the system. To me it feels like the AC Adapter isn't giving the machine enough power, but I don't know for sure.