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>
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