iMac boot problems...
Whenever I turn off my iMac (as I did a couple of days ago) I have major problems booting it up again.
The first thing that happens is the boot-up stops at the Apple logo - no progress bar (or anything).
In the past, I have tried to recover from my Time Machine - but to no avail: after going through the almost two hours of recovery, I end up with the same screen (just the Apple logo). So, I run Disk Utility, PRAM, and then ReInstall the OS (OS 10.14.6) - another couple of hours.
Usually (I rarely turn my iMac off) this works and I end up with the same Desktop etc that I had before.
Today was alarmingly different: the ReInstall option in Recovery offered Catalina which I don't want (due to addiction to iTunes).
My question - how do I ReInstall Mojave? (No, I stupidly never got around to making a boot disk.
Thanks for taking the time to read this and BIG TIA if you have a solution!
Den
PS I also don't know how to edit the description of my software/hardware that appears under the post.
PPS Aside from this boot thing, the iMac is trouble-free.
iMac with Retina 5K display, macOS 10.12