My MacBook Air screen got frozen at the very first screen page totally. This problem persists after I failed to install the new OS Captain). I have powered off and on a few times, but the screen still freezes at the user name page. Please help! Thx!

My MacBook Air screen got frozen at the very first screen page totally. This problem persists after I failed to install the new OS Captain). I have powered off and on a few times, but the screen still freezes at...
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