But doesn't installing a new version of an OS basically wipe the old one clean, 
then install the new one, just leaving the settings and all?

Sent from my iPhone

> On Oct 14, 2015, at 11:59 AM, Scott Granados <scott.grana...@gmail.com> wrote:
> 
> +1, very well said and I totally agree.  This is almost always the best way 
> to go.
> 
>> On Oct 14, 2015, at 12:46 PM, Anne Robertson <a...@anarchie.org.uk> wrote:
>> 
>> Hello Eileen,
>> 
>> I expect a heap of criticism for what I’m about to say.
>> I always recommend installing a new OS from a USB key and wiping the hard 
>> drive before doing the installation. You can then restore your data and 
>> settings from a Time Machine backup.
>> I’m so tired of seeing unpredictable behaviour when people just do an 
>> upgrade on top of the existing OS.
>> My husband is currently on a long phone call with a client who tried to 
>> install El Capitán on top of Yosemite, and her machine will no longer boot.
>> 
>> Once the machine is in a bad way, the best thing to do is a clean install 
>> from a USB key and not copy everything from Time Machine, but reconfigure 
>> the machine from scratch and only copy back your data from Time Machine.
>> 
>> Cheers,
>> 
>> Anne
>> 
>> 
>>> On 14 Oct 2015, at 18:05, Eileen Scrivani <etscriv...@verizon.net> wrote:
>>> 
>>> Traci,
>>>  
>>> On Sunday, I called Apple tech support with what I thought would be a 
>>> simple question and fix to problems I experienced while using IBooks.I did 
>>> the upgrade to El Cap from Yosemite.
>>>  
>>> Apple tech shared  viewing my computer and observed the behavior.  I 
>>> literally spent about 3 hours on the phone with them.  The exact problem 
>>> you describe with VO just stop working – no sound – kept happening across 
>>> the board.  I kept having to use command F5 to turn it back on (I never 
>>> turned it off to begin with).  Finally the tech rep suggested restoring the 
>>> install of El Capitan.  The system would not even allow me to 
>>> restore/reinstall the software.  Bottom line is I have an appointment set 
>>> up on Friday morning to bring the Mac book into them and let them work on 
>>> it in the Apple store.  I’m very disgusted with the computer at this point.
>> 
>> 
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