Why is my MacBook kept turning off after the Log-in screen?
I have an MacBook Pro 13", Unibody Mid 2010, 2.4 GHz, dual core i5, Model# A1278. It seems to be normal when I started it up. But it kept turning off after I logged in. What's problem can it be? So far, I tried to start up by holding Command key + R. Then it took me to the OS X Utility screen with 4 choices "Restore From Time Machine Backup", "Reinstall OS X", "Get Help Online", and "Disk Utility". What problem do I have? And is it possible I can backup my latest data to an external HD now? Thanks in advance for any help!
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