MACBOOK CAN NOT START

My Macbook bought in 2012  froze when I was watching online Videos, so I held down the power button. Once it turned off, I tried turning it back on. I can hear the sounds of machine starting , nut it only showed the apple logo (or a folder with question mark or a few lines of black words), it wont go into the system. I tried safety mode, the problem was solved .But when I watched TV SERIES again , it froze again .I tried many time ,this time, I even can not start through safety mode.Anyone can help me?

Hey MINGQING,
You may want to try to use the further troubleshooting steps found in this article to see if they will help you resolve this issue with your startup procedure:
Troubleshooting: My computer won't turn on
http://support.apple.com/kb/ts1367
Thanks for using the Apple Support Communities. Have a good one!
-Braden

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