Attempting to reinstall via USB Thumb drive, computer turns off
I am attempting to reinstall MAC OSX onto a Mac Pro tower (it is either a 2011 or 2012 model, I am fixing it for a friend).
He deleted the OS from it, but the recovery is still available when I boot the computer and hold down alt/option, but when I select the recovery or select my bootable USB OSX, the computer seems to 'hang' and then it cuts the power.
My friend says that it worked for him before, but he forgot the password and attempted to reinstall the OSX but did it wrong.
Has anyone else seen something like this and if so, what advice could you give?