Mac OSX freezing up

I have two fairly new macs that are hooked up via active director service. For some reason when there is a power outage or if they need to be rebooted. The get stuck at the loading screen. The only way  to fix the issue is to reboot into safe mode. And the restart again. Any thoughts.
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May have to reinstall the operating system. If a file got corrupted during a power outage, it is messing up the boot process. The safe boot also clears some caches, checks the disk for errors.


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Try to reset PRAM

If the macs have some attached USB peripherals, check in System preferences -> StartupDisk that the disk which is booting from, is the right one; by default MacOS is using as Startup Disk the last disk used, so if you do not clearly specify the StartupDisk, MAcOS can search to boot from USB stick or printer NVRAM, etc.

If neither will not solve the problem, please tell me:

What version of MacOS operation system do you have?

What do you mean by "loading screen"? The boot-up process of a MacOS has a few phases, in every phase the screen looks different:

POST - startup chime
Booter selection (startup disk selection). - If passed, dark grey Apple's logo appears. If fails, a folder icon with question mark is flashing
Kernel Loading - is marked by a spinning gear. If a spinning globe appears, that means that the kernel is loaded from network. If fails, a prohibition sign appears
Please tell me which of this signs are the "loading screen"? . For every step where is blocked, there are some troubleshooting steps.

Also, be sure that the MacOS has the newest updates!

Best regards!
Reset the SMC first, then reset the PRAM.

To reset the SMC on all newer laptops without users serviceable batteries;
Turn off Laptops
Plug in power
Hold the Left Shift Control Option keys then Hold the power button for 15 seconds.

If that still doesn't solve your problem, you may just have some corruption.

Boot into Recovery mode.
Run Disk Utility
Repair Disk

You can also Recover the OS.  Make sure you make a backup first in case of problems.

Boot into Recovery Mode
Select Install OSX
Install OSX

It should install without wiping your system settings or user settings.
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Mac OS X

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