Urgent Problem: Mac Mini Not Booting Up...

Hi all, I've tried turning on and turning off my Mac Mini many times today and it just won't boot up. It seems the loading bar with the Apple logo gets to about 50% then just stops progressing.

What can I do?


Has invited:

howapple - hello

Favor from:

I just rebooted the Mac Mini and held down the "Option" key and then I told the Mac Mini to boot from the external USB HDD that was already running OSX Yosemite and now it's running great.

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