Administrative Professionals Conference.Online Training – Municipal Utility and County Utility Board Members.Online Training – Utility District Commissioners and Utility Authority Board Members.Utility District and Utility Authority Commissioner.Municipal and County Utility Official Training.This is not what I want to > do as this is not a clean install. > Today, I fall back to plan C - take my HD Toaster & backup HD with > 10.8.5 and CC duplicate it on those HD's. ![]() But, still, no way to > download Yosem ite, El Capitan or Mavericks or any older OS X - the > Apple support page had the download buttons for those options > 'greyed' out. > After attempting a Sierra install and failing (message to the effect > ' can't do that '), I connected FireWire 800 and booted TDM in the > newer iMacs then the older iMacs came up ok. > The campus OIT dept will completely wipe, 7 times overwritten, iMac > HDs and they are left unformatted in the machine - but with PC HDs, > those are removed & several holes drilled into each one. Trouble is with the > 'older' 2.66 GHz Intel Core 2 Duo models. > This time, simply using an OS X Sierra USB installer only worked on > iMac units that were built in 2012 or later. > So, I've just bought 6 iMacs from our university's sale site, > - which I've done several times over the past 15 years. > Great group, I read posts almost every day, sharing what I've learned > with co-workers that own Mac's. Good luck! Denver DanOn Sat, 07:40:59 -0500, Mark McLain wrote: I think James S aimed you at function links for downloading older versions of OS X. USB and now USB C and maybe a Thunderbolt cable? A couple of adapters such as Thunderbolt to FireWire. FireWire 400 and 800 cables might still be necessary. An Ethernet cross-over cable is not longer necessary. I use to carry in my Mac kit bag a variety of cables to work with different era Macs. So the macOS X 10.12.6 Sierra Combo Updater dmg file will update all versions of X 10.12.6 Sierra back to 10.12.0. The Combo Updater system updater updates all previous versions of a major OS X back to the first iteration after a major upgrade. You can download the Combo Updater dmg files from Apple and put them on a flash/thumb drive or an external portable HD and use them to update. With Disk Utility you can reformat an HD and then install a clean system on it. The bootable OS X installer on a flash/thumb drive contains it's own Disk Utility, Terminal, and other items that are very useful. > For older systems, I used to make a bootable DVD system install disc. The flash/thumb drive should first be reformatted for MacOS Extended (Journaled) and when High Sierra arrives that would change to, I think, APFS. Then you need to know the Terminal command line command that makes this happen and it's automatic after that. Instructions are available on line from places like OS X Daily and MacWorld. Start making a bootable OS flash drive installer for each OS. I urge folks to make a donation for such useful free software!! New updates arrive several times a year for MacTracker and the app alerts you to those. ![]() MacTracker is extremely useful and it's donation ware. It has info about what computer runs what OS when made and the latest version that item can run. MacTracker is a database of every product Apple has ever produced. Download MacTracker app from the Mac App Store. ![]() Howdy.Mark, if you will be doing this type of Macintosh service on into the future I have some suggestions to make life easier.
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