My 13 inch MacBook Pro (Late 2011 Edition) turned itself off after I had left it on downloading a file yesterday. I have since tried to turn it back on without success, I have tried attaching my charging cable to the computer and the LED light doesn't come on at all, signalling that it is not charging, I have experimented with different power outlets around the house and none work. I don't believe the battery is dead... The computer is in excellent condition and is still under its 4 Year Warranty. Can anybody help me solve this issue of getting it back on. I have a number of crucial University documents on there. All help will be highly appreciated.