After forced hardware shutdown OS X 10.10 doesn't start

I have a mac mini late 2012 and I've had a clean installation mac os x Yosemite on it.
And I have a problem: After forced hardware shutdown my OS doesn't load. There is a white screen, the apple logo and loading line. But when loading reach approximately half of a boot it's just stop loading.
I've left my mac for a night to see will it load at the end or not. After 14 hours there were still apple logo and loading line on the same position.
After 5-10 forced reboot the OS finally start up.
I had that problem twice with same symptom.
The first time was after my mac was stuck and didn't respond, so I forced hardware reset.
The second time was when my electricity suddenly cut down for a couple minutes.
How to solve that issue?

Reinstall Lion, Mountain Lion, Mavericks or Yosemite without erasing drive
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported then click on the Repair Permissions button. When the process is completed, then quit DU and return to the main menu.
Reinstall Lion, Mountain Lion, Mavericks, or Yosemite
OS X Yosemite- Reinstall OS X
OS X Mavericks- Reinstall OS X
OS X Mountain Lion- Reinstall OS X
OS X Lion- Reinstall Mac OS X
Note: You will need an active Internet connection. I suggest using Ethernet
if possible because it is three times faster than wireless.

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>
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