Thank you Ronni
It is for this reason I am loathe to shut down in this way but in practice 
there is a point where it may be necessary.

As a matter of interest the update of my iMac,  which has many more programs on 
it and is more likely to contain some forgotten rogues,  went without a hitch.

I think perhaps we have come to the point where we can move on from this 
problem.   Thank you for your interest
  Barry

> On 18 Nov 2014, at 5:41 pm, Ronda Brown <[email protected]> wrote:
> 
> Hi Barry,
> 
>> I am more interested in your thoughts on coping with such a freeze and 
>> whether you have any suggestions on a course of action other than shutting 
>> down by means of the power?   I have always been loathe to shut down by 
>> turning off the power.
> 
> I am a strong advocate (as is Apple) that you should NEVER interrupt the 
> installation process once you have started to update your system.
> I'm loathe to ever suggest a 'Force Shutdown' by holding the Power button 
> during an OS X installation! 
> Doing this is NOT recommended as it has a high likelihood of interrupting the 
> installation process and causing something to go wrong, such as "Data loss".
> 
> Only ever do this if you have made a thorough backup of your Mac and 
> understand that you may lose all data that is not backed up. 
> I've seen computer operating systems 'hosed' because of this. Which then 
> required a "clean install" of the operating system.
> 
> I suggest that people just 'Wait It Out', sometimes it can take several hours 
> as the installation completes (depending on your Mac's system). Being patient 
> almost always resolves it.
> 
> What you could have done to see what was going on behind the scenes was to, 
> hit Command+L to bring up the installation log. This shows exactly what's 
> being transferred or copied.
> 
> Any Virus Protection program such as McAfee AV has been known to cause a 
> Freeze/stall when installing an OS X update.
> Again it is important to:
> 1. Make a full backup, ideally you should have a bootable clone of your 
> system that enables you to revert to the previous pre-update state.
> 2. Turn OFF sleep for both screen and hard disk.
>     Turn OFF Time Machine
> 3. Disconnect all peripherals except keyboard & mouse
> 4. Repair Permissions in Disk Utility
> 5. Verify the state of your hard disk using Disk Utility. If any faults are 
> reported, restart into Recovery Mode - go to Utilities > Disk Utility and 
> Repair your startup disk.
> 
> At least then you can be 'reasonably' certain that your system does not 
> contain any obvious faults that might cause an update/upgrade to fail.
>  
> Cheers,
> Ronni
> Sent from Ronni's iPad4
> 
> On 18 Nov 2014, at 3:11 pm, Barry Sexstone <[email protected] 
> <mailto:[email protected]>> wrote:
> 
>> Hi Ronni
>> 
>> The installation stalled at the end of the restart and never got to the 
>> Login and Diagnostics window.
>> 
>> On the screen there was a “box” with the word restarting and the usual 
>> progress bar which was at the right hand end.  The spinning gear was below 
>> this.   There was no Apple logo.
>> 
>> Installation was completed after forced restart,  I have no idea what caused 
>> the installer to freeze
>> 
>> The Macbook Air is only used for a very limited number of programs and has 
>> not had any third party system software  modifications installed.
>> 
>> I am more interested in your thoughts on coping with such a freeze and 
>> whether you have any suggestions on a course of action other than shutting 
>> down by means of the power?   I have always been loathe to shut down by 
>> turning off the power.
>> 
>> Thanks for your interest I will let you know if there are any any other odd 
>> occurrences with the MacBook Air but I don’t think it necessary to chase 
>> this down any further.
>> 
>> My next task is to update the iMac so keep your fingers crossed for me.   I 
>> will,  of course, repair permissions,  back up etc prior to this.
>> 
>> Regards
>> 
>> Barry
>>> On 18 Nov 2014, at 2:45 pm, Ronni Brown <[email protected] 
>>> <mailto:[email protected]>> wrote:
>>> 
>>> Hi Barry,
>>> 
>>> Apple mention - "You may experience unexpected results if you have 
>>> third-party system software modifications installed, or if you've modified 
>>> the operating system through other means.”  
>>> 
>>> I’m still not sure what happened with your 10.10.1 Update :(
>>> Did the installation stall at the end ‘Restart' - and you never got to the 
>>> Login Window & then Diagnostics & Usage Window?
>>> Was there just a  “a small dark gray spinning gear” .... NOT "a small dark 
>>> gray spinning gear below the Apple logo”?
>>> After you  ‘forced a restart’  - the installer completed the installation?
>>> If so: What caused the Installer to ‘freeze’? 
>>> -------
>>> The primary system initialization stages in OS X are:
>>> Each primary stage of system initialization can be indicated by the 
>>> following: 
>>> 
>>> firmware, startup chime or bright flash of the power-on light, followed by 
>>> a light gray screen on the primary display;
>>> booter, a dark gray Apple logo on the primary display;
>>> kernel, a small dark gray spinning gear or spinning earth icon below the 
>>> Apple logo; 
>>> and system launchd, a white screen on all displays followed by the login 
>>> screen.
>>> 
>>> If you saw "a small dark gray spinning gear or spinning earth icon below 
>>> the Apple logo" the ‘Restart’ hung at kernel just before system launchd
>>> 
>>> The kernel provides the system’s foundation and loads additional drivers 
>>> and the core BSD UNIX system. 
>>> It is indicated by a dark gray spinning gear below the Apple logo on the 
>>> main display.
>>> 
>>> The system launchd process is ultimately responsible for starting every 
>>> system process. It also manages system initialization and starts the 
>>> loginwindow process.
>>> During system initialization, the system launchd process automatically 
>>> starts /System/ Library/LaunchDaemons, / Library/LaunchDaemons, 
>>> /Library/StartupItems (via SystemStarter), and the /etc/rc.local UNIX 
>>> script if it exists.
>>> 
>>> So, I am no clearer to understanding what went wrong with your Installation 
>>> Process.
>>> Was it the Installer  - (you only saw  “a small dark gray spinning gear”) ?
>>> or Was it The Kernel - ( you saw  "a small dark gray spinning gear or 
>>> spinning earth icon below the Apple logo” ?
>>> 
>>> Cheers,
>>> Ronni
>>> 
>>>> On 18 Nov 2014, at 11:59 am, Barry Sexstone <[email protected] 
>>>> <mailto:[email protected]>> wrote:
>>>> 
>>>> Ronni
>>>> 
>>>> Installation is complete and OS is 10.10.1
>>>> Disk was repaired prior to updating.   As I mentioned before all appeared 
>>>> to go well until at the end of the re-start when the computer “hung” just 
>>>> showing “restarting” with the gear wheel.   It was in this state for 
>>>> nearly 3 Hours prior to powering off.
>>>> 
>>>> Barry
>>>> 
>>>>> 
>>>>>> On 18 Nov 2014, at 10:37, Ronni Brown <[email protected] 
>>>>>> <mailto:[email protected]>> wrote:
>>>>>> 
>>>>>> Hi Barry,
>>>>>> 
>>>>>> Are you sure you have completed installation -  Check 'About This Mac’ - 
>>>>>> does it show OS X Yosemite Version 10.10.1? 
>>>>>> Did you do the normal preparation before commencing the Update?
>>>>>> 
>>>>>> Here's the step by step way to update:
>>>>>> 
>>>>>>  1. Repair Permissions using the Disk Utility on the drive to be updated*
>>>>>>  2. Backup your current installation using Carbon Copy Cloner, 
>>>>>> SuperDuper; or Time Machine
>>>>>>  3. Use the Software Update to download and install 10.10.1 (no Combo 
>>>>>> until .2 update);
>>>>>>      Or Download directly from Apple Downloads 
>>>>>> <http://support.apple.com/kb/DL1779?viewlocale=en_US&locale=en_US> (if 
>>>>>> you need to install on more than one Mac)
>>>>>>  4. Re-boot;
>>>>>>  5. Run Software Update as other software updates for your computer may 
>>>>>> appear, which you should install. Also some updates must be installed 
>>>>>> prior to others.
>>>>>>  6. Repair Permissions 
>>>>>> 
>>>>>> If you have TRIM enabled, check to see if it is affected by this update. 
>>>>>> 
>>>>>> Note: ”Combo" updates only roll up the dot releases between major 
>>>>>> updates. So a "Combo" 10.10.2 will appear when 10.10.2 is released, 
>>>>>> because it "combines" the updates of 10.10.1 and 10.10.2. But nothing 
>>>>>> before then.
>>>>>> ==============
>>>>>> My Installation of OS X Yosemite 10.10.1
>>>>>> My Installation only took 10mins to install and complete setup, as per 
>>>>>> below:
>>>>>> 
>>>>>> OS X Yosemite 10.10.1 Update Installation:
>>>>>> 
>>>>>> The installation process took only 10 mins (commenced install @ 9:48am - 
>>>>>> completed installation and log-In @ 9:58am)
>>>>>> 
>>>>>> 1. 9:48am - Opened OSXUpd10.10.1.dmg - clicked  OSXUpd10.10.1.pkg
>>>>>> 2. 9:52am - Installer Restarted computer to begin installation
>>>>>>     Apple Logo with Progress Bar 
>>>>>>     Then a Blank Grey screen
>>>>>>     Then a Black Screen
>>>>>> 3. 9:56am - Login Window appeared - I logged In
>>>>>>      Diagnostics  & Usage Window appeared - “Send Diagnostics & Usage 
>>>>>> Data to Apple” (I don’t select)
>>>>>>      Click ‘Continue’ - Setting up your Mac window appears 
>>>>>> 4. 9:58am Installation & Setup Complete - (TOTAL time 10 mins)
>>>>>> 5. I ran Software Update just to check if any further updates had 
>>>>>> appeared & needed to be installed
>>>>>> 6. Ran Repair Permissions
>>>>>> 
>>>>>> And I was back at work by 10am.
>>>>>> 
>>>>>> Cheers,
>>>>>> Ronni
>>>>>> 
>>>>>> 17" MacBook Pro 2.3GHz Quad-Core i7 “Thunderbolt"
>>>>>> 2.3GHz / 8GB / 750GB @ 7200rpm HD
>>>>>> 
>>>>>> OS X Yosemite 10.10.1
>>>>>> Windows 7 Ultimate (under sufferance)
>>>>>> 
>>>>>>> On 18 Nov 2014, at 8:48 am, Barry Sexstone <[email protected] 
>>>>>>> <mailto:[email protected]>> wrote:
>>>>>>> 
>>>>>>> In the absence of other advice I have shut down the Air by powering 
>>>>>>> down, a procedure I hate to use.   Start up now seems OK.
>>>>>>> I would still like to know if anyone has suggestions as to how this 
>>>>>>> sort of problem may be overcome without the drastic step of shutting 
>>>>>>> down by powering off.
>>>>>>> 
>>>>>>> Barry
>>>>>>> 
>>>>>>> 
>>>>>>>> On 18 Nov 2014, at 8:15 am, Barry Sexstone <[email protected] 
>>>>>>>> <mailto:[email protected]>> wrote:
>>>>>>>> 
>>>>>>>> My MacBook air 2012 appears to be hanging after an attempt to up date 
>>>>>>>> from 10.10 to 10.10.1.   Update was done via app store and all 
>>>>>>>> appeared to go routinely until the restart.   The machine appeared to 
>>>>>>>> shutdown normally and the initial restart appeared normal with the 
>>>>>>>> advice “restarting” appearing on the screen.   The progress bar went 
>>>>>>>> all the way to the right and then nothing further happened.   The 
>>>>>>>> “gear wheel” is still running and the “restarting” message is still 
>>>>>>>> showing after over an hour.
>>>>>>>> 
>>>>>>>> Advice as to my next step?
>>>>>>>> 
>>>>>>>> Thanks 
>>>>>>>> 
>>>>>>>> Barry
>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> iMac 10,1
>>>>>>>> Intel Core 2 Duo 3.06 GHz 
>>>>>>>> 16GB RAM
>>>>>>>> 1.0 TB HD
>>>>>>>> OS X 10.10
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