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You could:
1. Take the bad RAM DIMM out
2. GENTLY clean the contacts
3. Put it back in
4. Try the RAM test again...
 
You could:
1. Take the bad RAM DIMM out
2. GENTLY clean the contacts
3. Put it back in
4. Try the RAM test again...


I reseated a few times and ran both rails and separately. I'm pretty confident one is shot.

Newegg has my exact rail for $70, so not thaaaat bad. lol

I understand lots of things go wrong with bad ram including kernel panics. Multiple ext. hdd's seem to connect both directly to the Mini and vis the hub in the few possible connections I tried since removing bad ram. <knock on wood>

What I'm going to do now that I have good ram running, is try OS restores on both my Sierra system and onto the Mavericks clone. If restoring Mavericks and it winds up booting properly and not aborting would be a real good sign. I'm just trying to find any possible solution before the last resort of doing clean installs
 
Also -- could it be the RAM -SLOT- that has gone bad, and not the DIMM?

To find this out, I think you'd have to do this:
1. Label the DIMMs ("1" and "2")
2. Begin with DIMM #1. Put it into the top slot. Leave the other slot EMPTY.
3. Run like this 2 days -- how does it do?
4. If good, put it into the bottom slot and run for 2 more days.
5. Did DIMM #1 work in both slots?

Then, repeat this entire process with DIMM #2.

If a slot is bad (not the DIMM), you could buy a new DIMM, and have the same problems again!
 
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Ah, OK. Thanks. I'll put the one that's in there now I know tested good and thats in the slot that's good into the other slot and do a test that way.

On the main front, I crossed my fingers and re-installed Mavericks onto that clone that was aborting startup. It Worked!! She boots up! <knock knock knock>

Now I'm going to do the same and re-install the main system Sierra and hopefully right any systemic weirdness I've been getting from all this.

If I can go without the whole clean install business, it'd be great
 
I have an 2013 iMac with an external SSD on which the OS is installed. Have an internal spinner and wanted faster boot times..
since I upgraded to high sierra, it was almost impossible to boot from the external SSD. I also formatted that SSD to APFS (Second mistake?).. so I downdgeaded to Sierra and NTFS and all is golden again. Have to say that I never doengraded before.. didn’t think I would. Surely not on OS X...
 
Last edited:
Knock on wood, after some OS X re-installations and getting a new ram rail to replace the bad one things are operating much better
 
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