So I've tried searching around and couldn't find any solutions to my problem. I have a 2011 MBP 15" It was my buddies before. He used it fine and dandy he says. But then I bought it from him two days ago and I just recieved it today. Battery isn't working. I plug in the Magsafe it's green. Then MacBook automatically turns on. I get an error once i'm on the main desktop "Date/Time is set to (date) (2001)" I check at the battery indicator it flashes all of the lights 5 times the same time. So whenever I unplug the Magsafe It would just shut off... I tried restting PRAM I tried SMC Reset I already set up an appointment for tomorrow with Apple Store Genius Bar. Any of you know what's going on??