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Start up problems with SSD and Yosemite

The past couple of years my MacBook Pro has served me well. It has a 3. party Samsung 830 series SSD 256 GB build in.

Last week I installed af security update to Yosemite, and since then it has been an up hill battle. When ever I start up the computer I’m met with a stop sign. Since nothing seems to work, I have deleted the SSD and reinstalled Yosemite from scrath. Occasionally I’m able to get it up running, but when ever it has to be restarted, you never know what the resulted will be.

The most stabled solution I have been able to find, is to reinstall Mountain Lion, that came with the computer. Now it restarts every time (I think), but it is still showing the stop sign at first for about 2 seconds, and then it starts.

I have tried disableling Kext to see, if this makes a difference. It does not.

Just for testing I have installed Yosemite on ad memory card, just to see if it boots. It boots up just fine. Off course this isn’t a solution, that can actually be used to anything.

So, any ideas or comments are wellcome – I’m running out from ideas.

I’m considering changing the hard drive to the on of the latest Samsung SSD, e.g. Samsung 850 EVO 250GB SSD or the new pro version, but I would hate to do this, if the outcome will be the same.

But as the computer boots fine from the memory card, it would indicate, that it is the SSD that is defect.

MacBook Pro, OS X Yosemite (10.10.2)

Posted on Mar 29, 2015 3:13 AM

Best reply

OGELTHORPE

Level 9

57,305 points

Posted on Mar 29, 2015 3:21 AM

It could also be the internal SATA cable. Take out the SSD and install it in an external enclosure. Connect it to the MBP via USB and see how it performs.

Ciao.

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19 replies

bossen16 Author

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Mar 31, 2015 9:03 AM in response to OGELTHORPE

Well, I bought both a USB connector and a brand new SSD hard drive. The new SSD hard drive doesn't work either, and I'm returning it. Has to be the cable then. Meanwhile the MacBook can't even find the SSD, which supports that I'm having a defect SATA cable. Just to keep you posted.

Mar 31, 2015 9:56 AM in response to bossen16

Hi,

without reading all the posts so far, I had similar problems after an update in Yosemite with 3rd party SSD. I solved the problem by deactivate TRIM _before_ updating. After the update I reactivate TRIM.

This solved my problem.

bossen16 Author

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Apr 2, 2015 5:36 PM in response to gerhard221

Thanks for reply. I have tried both disabling trim and kext, but it makes no difference. I think my problem is a broken SATA cable. I can run the Samsung SSD 850 from a USB 3 connector, but not from inside the MBP. It took me a while to figure out how to do this. Every time I tried to boot the computer up from the USB, the process stopped after a while (stop sign). Now I can in fact boot it up. The method is this:

Press the on-button
When the process seems to get stuck, quickly disconnect the USB wire and put it back in
The Mac boots up like normal-

It seems that the SSD somehow looses connection while booting, and the way to correct this is to follow the steps above.

I can live with this, until the cable arrives. But its not a long term solution. Every time the computer goes into sleep mode, the USB looses connection, and I have to force restart... If anybody has any workarounds, you are more than well come.

Maybe I should note, that I'm running Mavericks right now to rule out any kext and trim problems.

bossen16 Author

Level 1

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Apr 7, 2015 8:09 AM in response to OGELTHORPE

Solved!

A new cable was the solution.😁 Now the spare SSD goes into the DVD drive.

Thanx OGELTHORPE 🙂

Start up problems with SSD and Yosemite