What's wrong with my samsung cleo? It keeps turning on and off.?

it randomly shut off on its on, so try to turn it back on again. Once i turn it back on, it randomly shuts off and turns back again continuously and it WON'T go to the main menu with the LCD pic and what not. So basically, i can't use my phone. What's wrong with it? and how can i fix it?

Btw, this happened before. It took a while before it stopped continuously turning on and off and it went back to normal. This time, it took a day!
 
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