My macbook pro retina keeps on shutting down when installing OS X(Mountain Lion). Why is it so? Can anyone help? Thank you!

My macbook pro retina is experiencing random shutdowns. I reformatted my macbook pro but before that, I have windows 7 bootcamp on my macbook together with mac os mountain lion. So, I reformatted and installed OS Mountain Lion, but the installation is not working well as it keeps on shutting down halfway. Please help!