Hi Pat,


If it was me, I would first try and ascertain whether it was a hardware problem 
or just the OSX installation which had got messed up.


I am assuming that you don’t have a bootable clone of the Mac that predates 
your problem? If you did you could just try booting up from the clone and if it 
was just  the OSX installation which had got messed up then the Mac should boot 
up OK from the clone.


If that was the case you could just clone the clone back to the main HD and, in 
effect, rewind your system to the pre-problem status.




However, assuming you don’t have that option then the fact that the screen gets 
as far as the white Apple shows that the hardware is working on some level - 
but does not rule out hardware problems. Apple computers include high-level 
hardware test/diagnostics routines which you can run BEFORE the computer tries 
to load up the OS.


Depending on the age of your Mac this may be called Apple Hardware Test (for 
pre June 2013 machines) or Apple Diagnostics (for machines introduced after 
June 2013). The basic procedure is the same in both cases - disconnect external 
device, shut down the Mac and then switch on and hold down the D key.


You should first read the Apple support articles here:


How to use Apple Hardware Test on your Mac  

How to use Apple Diagnostics on your Mac  


Be aware that the tests can take some time to complete – so don’t worry if it 
seems “stuck” for a while.


If the Mac passes this test, you should probably look at reinstalling the 
system – but the best approach will depend on what sort of backups/clones you 


Hopefully, this should give you a much clearer picture of just where your 
problem lies.











Neil R. Houghton

Albany, Western Australia

Tel: +61 8 9841 6063

Email: n...@possumology.com



From: <wamug.org.au-wamug-boun...@lists.wamug.org.au> on behalf of Patricia 
Scott <clamsh...@iinet.net.au>
Reply-To: WAMUG <wamug@wamug.org.au>
Date: Thursday, 15 August 2019 at 09:58
To: WAMUG <wamug@wamug.org.au>
Subject: Re: Serious problem




Thank you very much for the information. Unfortunately, it didn’t work. The 
same black screen with just a white Apple is all that is visible.


I read all the rest of the support information, and I think the only option is 
to take it in to a repair shop and hope for the best.


Again, many thanks,


On 15 Aug 2019, at 6:37 am, Ronni Brown <ro...@mac.com> wrote:

Hello Pat,


You could try:

Shut down your Mac, then turn it on and immediately press and hold these four 
keys together: Option, Command, P, and R. 

You can release the keys after about 20 seconds, during which your Mac might 
appear to restart.



Kind Regards,


 Ronni Brown’s iPad Pro 12.9-inch 256GB 


On 14 Aug 2019, at 3:56 pm, Patricia Scott <clamsh...@iinet.net.au> wrote:

I have a Wacom pen tablet. Yesterday a message came up on the computer that the 
firmware for the tablet needed to be updated because in the new Mojave update 
Apple neglected to classify Wacom as safe software, and it was necessary for 
users to modify items in the Security Preferences panel.

So I read the instructions and followed them (I thought).
Unfortunately, I think I omitted a step and then tried boot the computer. The 
result was that the monitor now shows only the white Apple and the stalled 
progress bar.

I did a Safe boot, but it didn’t work.

I hope the really savvy members might know how this can be remedied. 

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