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.
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.
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.
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
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
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