Problems upgrading to macOS Mojave on MacBook Pro 2018

It's possible you had broken stuff in the backup that was ok in High Sierra, but showed up in Mojave. Especially since the clean install worked, and then it broke after restoring TM. For many years, I didn't even bother with TM, and just backed up manually what I needed to keep, when doing a clean install. Always has been a reliable solution for me.

For me I have a lot of mailbox and huge amount of data on mac.

TM puts that all back in place.

I did have issue earlier in year but that was trying to use NAS as TM source.

And my USB 3 external drive had multiple (weekly backups for 6 months or so) it did not like that too much.

I was migrating to machine I have now 2017 MBP, but still had old MBP so I created a fresh TM back up and migrated that first go without issues.

Understood. I Primarily use Gmail, and iCloud, so both are iMAP services, so no reason to back up email as it's stored in the cloud. With that said, I usually just save my documents, (including Virtual Machines) and anything specific that can't be recreated on the new install without a lot of time and effort. then I just restore the items back to the appropriate places, and I'm good to go, usually takes about an hour, maybe 2.

dmauch, You might be experiencing something called "RAM Creep". It's where one or more modules have become improperly seated. To check, disconnect iMac after shutting down, lay it on a towel or on a bed display down, open the RAM door on the back, take out the DIMMS, and reseat them. close up the Mac and see if those memory messages go away. RAM creep can be caused by improperly seated RAM, or the process of heating and cooling for them to come loose. Also, keep in mind, if you've upgraded your RAM to a third party manufacture, and it's NOT the stock Apple RAM, iMacs can be extremely sensitive to damaged, or incompatible RAM. If you are using Apple's Stock RAM, and reseating doesn't fix, I would make a genius appointment and have them check for bad RAM. You could do this at home with diagnostic tools, but it depends on how down and dirty you want to get in diagnosing your problems.

Also, if you're iMac is under warranty, while testing the RAM yourself at home, won't void the warranty, taking it in should get you a free RAM replacement, if it's damaged.

Yes in my case on iMac couple years ago I had 2 apple (i think hynix brand) in and 2 third party ones.

The 3rd party ones were the faulty pair.

the onboard diagnostic did not pick up the problem, only the apple tests which are more rigorous did.

Many thanks DVD for your further insight. My iMac only has the stock Apple RAM that came with it. But one other observation I would make. The Activity Monitor showed an extraordinarily high Memory use - kernal_task (952.9MB) suggesting I believe the need to drive the fan. Is this not somewhat odd?

Have completed everything that has been suggested in this thread:

Uninstalled CleanMyMac 3

Uninstalled BitDefender

Ran Entrecheck twice - No issues/Excellent Performance

Ran Disk First Aid - No issues

Ran Disk Warrior from bootable flash drive, optimized HD to a perfect 10 which was already at 9, repaired a number of minor issues

Ran inbuilt Hardware Test - no issues

Removed and reinstalled the two DIMMS to check for "Ram Creep"

Asked Trump to have an FBI investigation into Mohave OS - (they refused for lack of corroborative witnesses)

Perhaps now I ought to leave well enough alone and wait for Apple's patch(s) since it certainly appears as though there is nothing wrong with my iMac.

The only other thing grasping at straws is too swap the 2 rams around.

I still think a genius appointment or phone conversation with support is worthwhile.

There might be something overlooked here.

Also it is an official route into getting it sorted.

As I said before there has not been a large failure on installs and unless this is flagged up the new builds will keep coming without a full installer.

It's just a strange situation. I walked my mother who is almost 80, through upgrading her late 2013 air from High Sierra, to Mojave, and I wasn't there with her. I gave her the instructions in a text message she did it let it upgrade, and hasn't complained about any issues, or not being able to do anything. She also upgraded the iPhone I gave her without issues. So, knowing my mother is not technically inclined at all, but can follow instructions, and didn't have issues,

It does make me question how bad this issue really is. Logically if it was as bad as people make it to be, then I would have expected her to be the type of person to have issues.

As I indicated much earlier in this thread, I had long conversations with three different Apple tech’s - one who was a “senior tech advisor,” who promised to call me back in 20 minutes and it took seven hours - the result of high was absolutely nothing! The two, didn’t have a clue - I was more well-versed in Mac’s then they were - in fact one of them lamented that he had been “out of the loop,” and was “just getting back from a few days off.” Teriffic!

With my iMac running at park performance with High Sierra, I’m curious to know what exchanging the 2 RAMs around?

PickleBreath:, I think the best, and most respectful way for me to say this is:

I don't know anyone here personally, nor have I laid hands, or eyes on your specific setups.

So, there is no way to know 100%. All I'm saying is based on my own experience, and helping my mother. Also talking to others I have known online several years, but not personally, suggests that there may be, and are genuine issues. But to what extent in the broad spectrum is hard to say until Apple speaks up.

No pickle, what he’s say is that if 99.9% of Apple’s computers are unaffected by this, based on 1.3 Billion units offset by iOS devices, that would leave approximately a paltry 4,000,000 customers with upgrade problems - certainly not enough to worry about...unless of course you happen to be one of them.

I'm still trying to figure out in the last few comments what got people so stirred up. I was saying for me to give the best answer it helps to know the person and have access to the setup for myself. I think the whole issue with Apple, and the OS not installing for those who want it to, has caused tension in itself. I haven't had an issue with anyone has said here, and I moderate people on a different platform, so I deal with plenty of raised tempers and frustration at times.

While “freely,” typically means “at no cost,” I’m try to convey some of my free advice to you. You’ve quantified your assertion to a 99.9% success rate based on this thread with as many posters who have had problems with those that haven’t.Just look at a few other related threads ad see if your assertions holds up.

I don’t think it’s helpful or facilitating in any way for someone to make the outlandish claim that “based upon what I’ve seen here [with a dozen or so posters on this thread] 99.9% of the people upgrading to Mohave don’t seem to have a problem. Obviously, THERE”S a problem Houston and it needs to get fixed which I’m sure it eventually will. But to minimize or diminish the significance of the situation is to slow walk a solution for those of us affected by it. To do otherwise will stir up the troops!