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<blockquote data-quote="Happy-Granddad" data-source="post: 1790345" data-attributes="member: 384425">Hi MacInWin - I guess it's going to be a late night for me.I mentioned accessing the Mac from the MBP by way of Target Mode to show that there is information and structure still on the Mac.&nbsp; It also indicates I could alter the files on the Mac if necessary.When I described the use of dskutil and the little disk-checking script and the subsequent attempt to reinstall the HighSierra OS, it was in the context of having done, in one case a Recovery Boot, and in the other a SingleUser boot.&nbsp; In each case of reinstallation that I've tried, there seems to be continuous progress (indicated on the progress bar) initially quite excitedly, and subsequently almost infinitesimally, covering perhaps an hour and 20 minutes.&nbsp;&nbsp; Then there is a transition to a white screen showing a black Apple logo and a black progress bar which showed no change for over an hour.I'm now going to do a Recovery boot and let it run overnight while I am sleeping (!) just in case you are right that it is my impatience that is at fault here.I didn't understand Ferrar's post about using the MBP to boot from the iMac drive.I'll be back!David</blockquote>

[QUOTE="Happy-Granddad, post: 1790345, member: 384425"] Hi MacInWin - I guess it's going to be a late night for me. I mentioned accessing the Mac from the MBP by way of Target Mode to show that there is information and structure still on the Mac. It also indicates I could alter the files on the Mac if necessary. When I described the use of dskutil and the little disk-checking script and the subsequent attempt to reinstall the HighSierra OS, it was in the context of having done, in one case a Recovery Boot, and in the other a SingleUser boot. In each case of reinstallation that I've tried, there seems to be continuous progress (indicated on the progress bar) initially quite excitedly, and subsequently almost infinitesimally, covering perhaps an hour and 20 minutes. Then there is a transition to a white screen showing a black Apple logo and a black progress bar which showed no change for over an hour. I'm now going to do a Recovery boot and let it run overnight while I am sleeping (!) just in case you are right that it is my impatience that is at fault here. I didn't understand Ferrar's post about using the MBP to boot from the iMac drive. I'll be back! David [/QUOTE]

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