860 Evo completely unresponsive-2012 mbp

AstonSenna

macrumors newbie
Original poster
Mar 18, 2019
4
0
Hello! It's time to come for some real help. I have a 2012 pro 2.9ghz 8gb that I've had a Samsung 860evo in for over half a year, been superbly fast with no issues whatsoever. Had enabled trim in terminal. Until a week ago, it started randomly freezing every other minute for a few seconds , thought it odd, so I saw an update for high Sierra so I decided to hit that thinking that'll fix it. Seemed fine and then while updating it seemed to freeze, I opened the log and it kept trying something and failing over and over and over like 15 times and then it timed out and froze so I did a hard restart and then got to prohibited screen about 5 times. I then go to recovery reinstall high Sierra and that fails. Then i do internet recovery and upgrade to Mojave thinking let's try it maybe itll fix it, buggy high Sierra or something. And that install works. Computer boots up great, and then it does same thing. Beach balls every single click for dozens of seconds each time. Total unresponsive. Run avast scan. Takes 26 hours to complete because it kept freezing. Reset pram and other tricks. No ioy. Total unresponsive. Spotlight finally stopped indexing and when it did all seemed good. Solid hour of bliss. Then it came back for good.

Popped in my old hdd on Yosemite and viola, computer works just as I remember on it. Slowish, but fine. So sata cable ruled out.

I decided to wipe it and do clean install using a Yosemite installer from USB. Did the clean install yesterday on my now erased 860 evo and the install took 15 hours. Got hung up on extracting file something for 8 hours alone in the log. Meanwhile I also bought a cheaper sandisk 480gb ssd to use as a proper backup. Cloned my old hdd to that, booted it externally and it seems to run fine.

Now for the good stuff. Downloaded blackmagic, ran the Samsung as it's still inside my mac and write speeds 150 to 300 at a few times at 5gb stress but read speeds? ZERO. well, actually 0.2. But ZERO . Connected the sandisk externally (should've mentioned using the affordable startech $10 sata USB connector) and it clocks couple hundred write speeds, and a few hundred read speeds , seems great for use through an external plug, right up to par. But the Samsung just isn't having it.


So where do I go next with this Samsung 860 evo? I thought it software issue, corruption of sort, but that's ruled out since I wiped it and did a clean install and problem still persists exactly as it was. Old drive worked fine plugged inside it so it's not a sata connector. Is the drive officially bad?


Thank you thank you!
 

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treekram

macrumors 68000
Nov 9, 2015
1,849
401
Honolulu HI
You should try the 860 Evo externally. There have been numerous instances reported of a faulty SATA cable where a HDD worked but a SSD did not. You can also try the SanDisk internally but if that's serving as your backup, I wouldn't do that.
 

AstonSenna

macrumors newbie
Original poster
Mar 18, 2019
4
0
You should try the 860 Evo externally. There have been numerous instances reported of a faulty SATA cable where a HDD worked but a SSD did not. You can also try the SanDisk internally but if that's serving as your backup, I wouldn't do that.
I would NEVER have thought of that, but I'll give it a go. The sandisk is a regular internal kind so it can go in just fine as well. I'll give it a go and report back.
 

AstonSenna

macrumors newbie
Original poster
Mar 18, 2019
4
0
You should try the 860 Evo externally. There have been numerous instances reported of a faulty SATA cable where a HDD worked but a SSD did not. You can also try the SanDisk internally but if that's serving as your backup, I wouldn't do that.
So installed hdd and booted from the Samsung externally...15 minutes in and not one hiccup. The picture shows the read and write speeds of it in background. Speeds are mega consistent. Have not dropped off one single bit . I think you were right! Because my hdd worked just fine inside internally I assumed it wasn't the sata cable and ruled it out.
 

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Fishrrman

macrumors P6
Feb 20, 2009
17,474
5,676
It's the internal drive ribbon cable.
Replace it -- if you know how to replace the drive, you know how to replace the cable.

Go to ifixit.com for the part number.
You can either buy the replacement cable from them, or order it online.

ONE EASY WAY to ascertain if it is the cable:
If you have the SSD (the one that causes you boot problems internally) "in your hand", you need some way to connect it to a USB3 port. One of these is a very handy tool to have around:
https://www.amazon.com/Sabrent-2-5-Inch-Adapter-Optimized-EC-SS31/dp/B017NIDXF0/ref=sr_1_sc_2?s=pc&ie=UTF8&qid=1480434478&sr=1-2-spell&keywords=sabremt+usb3+to+ssd

When you get this, connect the SSD to it, and then connect the adapter to a USB3 port.
Then, reboot with the option key held down CONTINUOUSLY until the startup manager appears.
Then, select the SSD with the pointer and hit return.
Does it NOW boot and run properly?
If so -- REPLACE the ribbon cable!
 

AstonSenna

macrumors newbie
Original poster
Mar 18, 2019
4
0
It's the internal drive ribbon cable.
Replace it -- if you know how to replace the drive, you know how to replace the cable.

Go to ifixit.com for the part number.
You can either buy the replacement cable from them, or order it online.

ONE EASY WAY to ascertain if it is the cable:
If you have the SSD (the one that causes you boot problems internally) "in your hand", you need some way to connect it to a USB3 port. One of these is a very handy tool to have around:
https://www.amazon.com/Sabrent-2-5-Inch-Adapter-Optimized-EC-SS31/dp/B017NIDXF0/ref=sr_1_sc_2?s=pc&ie=UTF8&qid=1480434478&sr=1-2-spell&keywords=sabremt+usb3+to+ssd

When you get this, connect the SSD to it, and then connect the adapter to a USB3 port.
Then, reboot with the option key held down CONTINUOUSLY until the startup manager appears.
Then, select the SSD with the pointer and hit return.
Does it NOW boot and run properly?
If so -- REPLACE the ribbon cable!

Replaced cable and viola! Seems to be running a marathon right now with ease. Thank you!!!