Macbook pro won;t open uppage to enter password shuts down
SOURCE: macbook pro unexpected shut down
After determining the battery health:
http://support.apple.com/kb/HT1519
Then calibrate the the battery:
http://support.apple.com/kb/HT1490
SOURCE: MacBook locked up, won?t close down
The first thing to try is this: It is a keyboard shortcut to shut down a mac laptop. Press the control key (ctrl) at the bottom and press the eject button at the same time (top button all the way to the right which looks like an arrow pointing up with a line under it). This should bring up a window asking if you want to restart, sleep,cancel or shut down. Click Yes to shutdown! If this does not work, here is the second option. Press the power button down on the upper right side,and just hold it down until the computor turns off. I have done this many times with my own computor when it has crashed with no ill effects, I have heard from Apple that it is not good for your computor and can cause problems, so I would only do this if the keyboard short cut does not work Good luck and if you find this helpful please comment!.
SOURCE: How do I reset master password for my macbook pro
Put in the system disk and then restart holding down the c key to boot up using the disk. Once booted up you go to the menu and then use the reset password item. Once changed shutdown and boot up as normal and eject the disk. Hope this helps.
SOURCE: Macbook pro resets every time it runs out of power
Your laptop contains a small battery (aside from the regular battery) that saves CMOS information like time/date and a few other settings.
When your computer loses all AC/battery power, the settings are reset to factory.
You'll need to replace this battery, normally it is a regular disk battery that can be purchased at any hardware store.
If you're not tech savvy, you can have a professional technician open up your macbook and it won't cost much more than $100.
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