MAC Mini does not restart after Yosemite update

I bought my MAC mini in 2011 and I successfully updated to Mavericks with no problems. I am not sure why my MAC Mini will not restart after I updated to Yosemite. The completion bar gets stuck around 30%.
Any help or ideas appreciated
Larry

Okay, this is strange. I tried restarting three times yesterday with the same results. In fact I left it go overnight only to find the next morning that the bar was still stuck at 30%. I did a hard boot a little bit ago and waited a few seconds. I restarted an it booted up fine.
Larry

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Try disconnecting any external devices, especially hard drives
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Well, see, the fact that it wouldn't let you boot from the MacBook install disks should have been your first clue to not try to do it. There's a reason it wouldn't let you. The MacBook install disks contain a version of the OS specific to the MacBook, in order to prevent people doing what you just tried to do (ie, installing the same copy of the OS on multiple machines).
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After latest Yosemite update my Mac book Air is not finishing to reboot, all I see is the white apple on the black screen and the progress bar whch loads slowly and kind of get stuck half the way to the end, and it stays there forever.
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Take each of these steps that you haven't already tried. Stop when the problem is resolved.
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b. If Step 1a fails because of disk errors, and no other Mac is available, then you may be able to salvage some of your files by copying them in the Finder. If you already have an external drive with OS X installed, start up from it. Otherwise, if you have Internet access, follow the instructions on this page to prepare the external drive and install OS X on it. You'll use the Recovery installer, rather than downloading it from the App Store.
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Step 2
If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use the technique in Step 1b, 1c, or 1d to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
Step 3
Sometimes a startup failure can be resolved by resetting the NVRAM.
Step 4
If a desktop Mac hangs at a plain gray screen with a movable cursor, the keyboard may not be recognized. Press and hold the button on the side of an Apple wireless keyboard to make it discoverable. If need be, replace or recharge the batteries. If you're using a USB keyboard connected to a hub, connect it to a built-in port.
Step 5
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
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Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to start up, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can start up now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
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If you've started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
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Safe mode is much slower to start and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
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Step 8
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Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
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If that should fail...
applesetupdone...
This was Posted by: JoseAranda at September 9, 2006 3:48 AM
"OK, restart your computer, hold down Command-s and type in the following:
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end of posted by: JoseAranda"
Reset OS X Password Without an OS X CD...
http://theappleblog.com/2008/06/22/reset-os-x-password-without-an-os-x-cd/

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This procedure is a diagnostic test. It makes no changes to your data.
Please triple-click anywhere in the line below on this page to select it:
defaults read /Library/Preferences/SystemConfiguration/com.apple.PowerManagement | pbcopy
Copy the selected text to the Clipboard by pressing the key combination command-C.
Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
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MAC Mini does not restart after Yosemite update

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