Samsung 840 Pro SSD is not recognized as internal drive

I had also the same problem, and ordered a new cable from eBay. After a few weeks thinking all went great, it suddenly gave me the same boot error (flashing folder sign with question mark).

No I'm really thinking whether it was just a faulty cheap cable, or my MacBook has another problem. Maybe I should try again with a cable from iFixit, which are a known brand and hopefully ship quality cables.

I had the same problem, blabla... But it worked doing something different.

Here's what I did:

Placed the SSD in the MBP early-2011, 15". As there is no recovery or secret Mac partition on it, when pressing Option I went into booting via the network. First time I did this in many many years of owning Macs, and to my surprise it loaded a setup OS. Went into Disk Utility, and there was my SSD, but didn't have a partition although I had prep it with a GUID partition and SuperDuper clone. SO created a partition, and then restored from a TimeMachine backup instead of trying to get the original HDD data. It actually started writing to the SSD, told me 15hrs...went to bed. And this morning (6hrs sleep) pressed the shift key with all my fingers crossed and there it was, a restored machine now working with 16GB Ram and a 500GB SSD, back in business. This is my backup machine for when my primary one fails (I'm a sailboat captain and need them to navigate, so a 2nd machine is important).

Patrick

Same problem here.

Inserted a blank Samsung EVO850 ssd (unformatted) into a mid 2010 13" MBP. Held down cmd-option-R. Got the folder with the question mark.

Inserted the exact same ssd into my mid 2010 15" MBP, help down cmd-option-R and got booted into internet recovery where I was able to format the drive.

Put the drive back in the 13" model and got the folder with the question mark again.

It works fine in one mac, but doesn't even get recognised in the other. So I've put the old hard disk back in the 13" one and am considering buying a replacement cable. I just have no idea what it could be other than that.

I've had that same issue twice, and used the same procedure as the original poster to clone the startup disk to the SSD in an external case. The first time was about 3 years ago putting a 3G 480 GB SSD into a 2008 15" MacBook Pro, and again last week replacing my daughter's 320 GB drive with a 6G 480 GB SSD in her Late 2011 13" MacBook Pro. The first time I called the vendor and they told me to reset the SMC controller.

Resetting the System Management Controller (SMC) on your Mac - Apple Support

It worked perfectly. The exact same thing happened with my daughter's MBP, and again the SMC reset worked perfectly in both cases. The explanation I got was the SMC reset made the computer look for new hardware.

Different machines and different procedures to do the reset, but all the models are covered in the procedure linked above.

Same problem here:

Macbook Pro 13" mid 2012

Boots fine on internal HDD.

Bought a Sandisk Extreme SSD 240GB.

Cannot see the disk and sometimes it could see the disk, using diskutility and formatting would get stuck on "waiting for drive to reappear".

Tried internet recovery, booting from an El Capitan USB pen, to reinstall OSX, but would hang and restart.

I then installed the SSD on a USB->SATA enclosure and installed El Capitan without problems.

reinserting the SSD back into the MBP I get flashing folder with question mark on it.

Tried resetting SMC + PRAM, nothing helped.

To my advantage, I have two identical MBP - both mid 2012.

SSD works perfectly in the one MBP but not in the other.

So I ordered a new HD cable off eBay and still NO success.

The one MBP cannot run on SSD's (although internal HD works fine) even with a changed cable.

The other SSD from the working MBP will not work in the "faulty" MBP.

Am completely stumped about this!!

I've tried all links on this thread, formatting SSD's, reinstalling in external enclosure e.t.c. nothing has helped.

The one MBP works flawlessly, the other not at all, even with a new cable. Yet a HD works fine in it, only a SSD does not.

Its driving me mad, someone help please?

Guys, good news !!!

Apple is finally starting a replacement program for the hard drive cable of the Apple MacBook Pro 13" Mid 2012.

It isn't officially announced yet, but I was on the phone with Apple Support Germany and they confirmed it exists since June 2016.

Here is the original source of the information (German, Google Translate):

https://translate.google.de/translate?sl=de&tl=en&js=y&prev=_t&hl=de&ie=UTF-8&u= http%3A%2F%2Fwww.ifun.de%2Fmacbook-pro-2012-apple-faehrt-stilles-austausch-prog r amm-96050%2F&edit-text=&act=url

"Apple authorizes a free replacement of the hard drive cable until three-years after the original purchase date or until June 10, 2017"

So, I suggest you give your Apple Support a call and ask for a replacement. Keep in mind it is just for the Apple MacBook Pro 13" Mid 2012 and no other device. The technicians might not know about this program, as it isn't officially announced yet, but they have it somewhere in the system and otherwise their supervisor should know more.

As you might guess this problem hasn't to do with the Samsung SSD, it's the hard drive cable which causes the problems.

I have the same Macbook Pro (MBP) Mid-2012 13-inch, Non-retina. I did an SSD and Ram( Memory ) upgrade.

After you clone your drive to SSD and get it installed you will need to enable "trim" support for your NON OWC SSD

Open "terminal app" and enter this command "sudo trimforce enable" Select YES, YES and reboot when complete.

Also remember to reset SMC,PRAM, and NVRAM on your MBP

http://www.macworld.com/article/2881177/how-to-reset-your-macs-nvram-pram-and-sm c.html

How to reset NVRAM (or PRAM)

If your Mac is not booting correctly or one of the functions listed in the previous section is acting strangely, you can perform a simple reset of your Mac’s NVRAM or PRAM. Resetting your Mac’s NVRAM or PRAM will reset the data stored to its default setting. (Note: As always, we strongly recommend having a complete backup of your important data before troubleshooting your Mac.)

The process for resetting PRAM and NVRAM is exactly the same. Simply follow these steps:

1) Turn your Mac off.

2) Turn on your Mac and when you hear the startup chime, immediately press and hold the Command-Option-P-R keys. (Note: You may need a wired keyboard for the reset).

3) Hold the keys until the Mac restarts and you hear the startup chime for a second time and then let go of the keys.

After resetting NVRAM or PRAM you may need to reconfigure some of your Mac’s settings. If you are still having issues with your Mac, you might want to consider resetting its SMC.

What is SMC?

On Intel-based Macs, SMC stands for System Management Controller. The SMC chip controls your Mac’s sleep function, power, various lights and indicators, fan speed, and keyboard backlights among other things. So if your Mac’s fan is out of whack, indicator lights are misbehaving, it won’t respond properly when closing the lid, or the Mac won’t turn on at all, you might want to reset the SMC. (Note: Again, be sure to have a complete backup of your important data before resetting the SMC)

How to reset SMC in a MacBook with a non-removable battery

1) Shut down the Mac.

2) Connect your power adapter to your Mac and to a power source.

3) With the Mac powered off, press Shift-Control-Option and press the power button at the same time.

4) Release all keys and turn on your Mac.

Your total cost might be under $200 however it will be well worth it. Your MBP will perform like a NEW $2000 MBP

You will be very happy. It might take you about 1 hour to perform this upgrade. Mainly because the cloning process takes a long time. The actual hardware upgrade will only take you about 15 minutes to complete.

Hello Alex,

I don't think you quite understood the problem here.

As I had written, I have 2x idtentical Macbooks.

The SSD works in one of them, but not the other.

So why should a trim support alter anything?

Furthermore, you CANNOT boot when the SSD is inside the Mac.

Do you mean to boot from a USB/HDD and then try to enable/disable trim on the SSD?

How would that help, when OSX CANNOT see the SSD inside the machine?

Thanks FromtheOrange for the advice. Will try to call a German authorized service center and hear what they say about this.

This problem is very common and very ez to fix

All u need to do is launch disk utilities then format/erase ur new ssd then ur problem will be solved