Restarting MacBook and doesn't work?

I recently restarted my MacBook pro and now it won't turn back on? It starts up and goes straight too Apple logo then the loading bar comes up it loads completly then turns itself off? If I turn it back on it redoes the Same thing everytime And just turns itself off again? How can I get it to work propely again? Help please

I recently restarted my MacBook pro and now it won't turn back on? It starts up and goes straight too Apple logo then the loading bar comes up it loads completly then turns itself off? If I turn it back on it redoes the Same thing everytime And just turns itself off again? How can I get it to work propely again? Help please

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