Urgent issue: Mac Mini not start...

Hi all, I've tried turning on and turning on my Mac Mini several times today and it won't start not just straight up. It seems that the loading with the Apple logo bar is about 50% then stops to progress.

What can I do?

Thank you!

Boot - grey, blue or white screen at startup, w/spinner/progress bar

Start - gray screen at startup - Yosemite

Resolve startup problems-

Resolve startup problems - (2)

Resolve startup problems - (3)

Tags: Mac OS & System Software

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