Can not turn on computer, blue screen an clock it's the only thing I get

After last turn off, I have tried to turn on my MacBook Pro, but the only thing I can get is the blue screen with the logo and the pinning clock, nothing else, need some advise, what could I do?

Thanks, but i tried as you suggested, the progress bar on the bottom just filled up to a 1/3 of it, then went like before, blue screen with logo and the timing clock... Any other suggestion?? Thanks

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