MacBook Pro glued on the filled during boot loading bar

My MacBook Pro (end of 2011; El Capitan 10.11.5) is recently become insensitive at the point of being unusable, so I decided to do a clean install, since I had to do one for a while anyway. Once I reinstalled El Capitan, I took my SSD (Samsung 840 EVO; 500 GB) out of the enclosure and put it back in my MacBook Pro, but it wouldn't boot. As a first step, it loaded so slowly that I decided to reset the NVRAM, who ends up helping just a little. The loading bar fills now halfway to the top with the usual speed, but after that, it takes a few minutes to complete. And once it is full, nothing happens. He remains on the Apple logo and the bar filled little matter how long wait.

I also put the 500 GB SSD with the clean install in an another MacBook (Late 2008) and it works fine, so the problem must be related to hardware, I just can't determine what exactly. I tried to do an AHT, but basic and extended trials got stuck shortly after and gave me no result. I had trouble with the kernel panics, so I suspect that something may be wrong with my RAM, as I exchanged the 4 GB to 16 GB just now. But before you go out and spend money on the new RAM, I wanted to know if maybe someone runs into this behavior before and knows exactly what's going on or if not how I understand what is wrong.

Almost all of the kernel panic seemed to happen every time I was using Photoshop or video in Safari streaming. I'll post an old report of kernel panic, but a problem with Time Machine has led to the removal of all my past, with the exception of the most recent backups. I hope someone can help me find another way to understand what is wrong.

Update: I just tried it on an other SSD (same model, 250 GB) which has been working well in my older MacBook and this time I get an error message as soon as the loading bar starts to fill to the top. It remains for a few seconds, then the MacBook stops and starts again; This continues in an endless loop. I have attached a picture below.

I really don't know how exactly to interpret this, but this looks like a kernel panic for me. What is my RAM after all? I appreciate any comment on that.

Connect the SSD to the external MBP via USB and see if it will start the MBP.  If so, the internal SATA cable is suspect.

If you can get the MBP to start, then you can start to deal with panics of the kernel:

https://support.Apple.com/en-us/HT201753

Also an EtreCheck report can be useful:

http://www.etresoft.com/etrecheck

Ciao.

Tags: Notebooks

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