Hi, Neil,

I have now tried the diagnostics test as you suggested, but sadly, that also 
had no effect. (My ‘puter is a late 2013 Mac Pro.)

I do appreciate your time and effort to help, and  I thank you very much.

Cheers,
Pat




> On 15 Aug 2019, at 6:26 pm, Neil Houghton <n...@possumology.com> wrote:
> 
> Hi Pat,
>  
> OK maybe I hadn’t explained the hardware test/diagnostics properly - the 
> Apple and the  progress bar should not come into it.
>  
> The first step is to switch the computer completely OFF – preferably using 
> the power button or, if all else fails, by turning off at the power socket.
>  
> Then, following the instructions on the relevant Apple support articles, the 
> hardware test/diagnostics is invoked BEFORE the computer can get to the Apple 
> and the  progress bar stage.
>  
> However, I guess I am probably more comfortable with all this – so I quite 
> understand that you may be more comfortable just leaving it to an expert like 
> Daniel.
>  
> Cheers
>  
>  
> Neil
> --
> 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 15:47
> To: WAMUG <wamug@wamug.org.au>
> Subject: Re: Serious problem
>  
> Hi, Neil,
>  
> The simple constraint is that the only items showing on the monitor are the 
> Apple and the  progress bar — absolutely nothing to click or see. At least, 
> it is rigorously protecting the computer.
>  
> I just now have written to Daniel.
>  
> Again, thanks — WAMUG rocks!
>  
> Cheers,
> Pat
> 
> On 15 Aug 2019, at 3:12 pm, Neil Houghton <n...@possumology.com> wrote:
> 
> Hi Pat,
>  
> When you say “it didn’t work” are you saying that following the instructions 
> for the hardware test/diagnostics failed to initiate the hardware tests (ie 
> the hardware tests did not run) – or are you saying that they ran OK but did 
> not indicate any problem?
>  
> You may be right when you say the problem is the botched changes to the 
> security panel – but in that case I would expect that, while the problem 
> might prevent the computer from booting up, the hardware test should run OK.
>  
> If the hardware test does not even run I would have thought it suggests other 
> problems.
>  
> But maybe you do need someone with more experience to look at it – maybe try 
> Daniel?
>  
>  
> Just my thoughts.
>  
> Please let us know how it all turns out.
>  
>  
> Cheers
>  
>  
> Neil
> --
> 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 13:58
> To: WAMUG <wamug@wamug.org.au>
> Subject: Re: Serious problem
>  
> Hi, Neil,
>  
> Thank you for this information, it’s a good thing to know. I tried it, but it 
> didn’t work, at least for this kind of situation. I am pretty sure that the 
> problem is the botched changes to the security panel: it has locked down the 
> whole computer and will need the attention of a trained person.
>  
> Thanks,again,
>  
> Pat
>  
> 
> On 15 Aug 2019, at 1:19 pm, Neil Houghton <n...@possumology.com> wrote:
> 
> 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  
> https://support.apple.com/en-au/HT201257
> How to use Apple Diagnostics on your Mac  
> https://support.apple.com/en-au/HT202731
>  
> 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 
> have.
>  
> Hopefully, this should give you a much clearer picture of just where your 
> problem lies.
>  
>  
> HTH
>  
>  
> Cheers
>  
>  
> Neil
> --
> 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
>  
> Hi,Ronni,
>  
> 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,
> Pat
> 
> 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.
> 
> https://support.apple.com/en-us/HT204063
>  
> Kind Regards,
> Ronni
> 
> 
> 
> 
>  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. 
> 
> Pat
> -- The WA Macintosh User Group Mailing List --
> Archives - <http://www.wamug.org.au/mailinglist/archives.shtml>
> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml>
> Settings & Unsubscribe - 
> <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug>
> -- The WA Macintosh User Group Mailing List --
> Archives - <http://www.wamug.org.au/mailinglist/archives.shtml>
> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml>
> Settings & Unsubscribe - 
> <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug>
> -- The WA Macintosh User Group Mailing List -- Archives - Guidelines - 
> Settings & Unsubscribe -
> -- The WA Macintosh User Group Mailing List --
> Archives - <http://www.wamug.org.au/mailinglist/archives.shtml>
> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml>
> Settings & Unsubscribe - 
> <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug>
> -- The WA Macintosh User Group Mailing List -- Archives - Guidelines - 
> Settings & Unsubscribe -
> -- The WA Macintosh User Group Mailing List --
> Archives - <http://www.wamug.org.au/mailinglist/archives.shtml>
> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml>
> Settings & Unsubscribe - 
> <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug>
> -- The WA Macintosh User Group Mailing List -- Archives - Guidelines - 
> Settings & Unsubscribe -
> -- The WA Macintosh User Group Mailing List --
> Archives - <http://www.wamug.org.au/mailinglist/archives.shtml>
> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml>
> Settings & Unsubscribe - 
> <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug>
-- The WA Macintosh User Group Mailing List --
Archives - <http://www.wamug.org.au/mailinglist/archives.shtml>
Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml>
Settings & Unsubscribe - <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug>