Hi guys, been a lurker for a long time here (Going on 5 years) sorry in advance if this is very long, but this seemed like the perfect thread to ask what to do.
In 2013 at Christmas I bought a SSD for my 13" MacBook Pro Early 2011 model, I upgraded from a HD to a Intel 530 Series 120GB I had a couple of bumps installing OS X on it but they were resolved and I got things working, I'm a student and I study networking so I do a lot of virtual work and this was a huge help to me, going on July/August my SSD took a big hit to performance and I had no idea why, it literally happened just one day after starting my mac up one day, I tracked the problem down to TRIM not knowing what it was at the time really screwed me over, I had a small idea on what it did but didn't realise it was completely necessary until my drive got down to about ~50MB-R/W. I started troubleshooting took my SSD out and put it in a USB 3.0 dock, slow speeds still so I made a Carbon Copy Cloner backup image of my SSD and then put it into my PC to use the Intel SSD program to secure erase it (Completely erase the cells, not just fill with 0s in Disk Utility) after I had done this I still suffered a performance hit so I resulted to it being the cable, I went to the apple store spoke to a guy he said I need to make an appointment, I knew this prior so I told him I want to speak to a genius about trim technology on 3rd party drives (Just something to boggle his mind, it worked) when talking to the genius I went upfront honest with him and told him I was running a optibay setup we shot the problem down to my Logic Board so I made an appointment for a week later. After getting my laptop back the techncian rang me saying that its my SSD because doing a logic board and SATA cable replacement didn't fix anything, so I took my SSD back since it had a 3 year warranty and got a Samsung 840 Series Pro instead.
I must say, I have had the absolutely worst luck with this SSD but that doesn't bother me, as long as I can get it to work I don't mind. First I did a quick format on my PC to make it usable, I then restored the backup CCC Image onto it, I then thought that it should work fine in my mac and theoretically it should however this didn't happen, my mac said it couldn't find the drive (Popped up with the folder with the ?), now its been roughly 4 days I've been troubleshooting, I have now installed OS X on a USB and can confirm my SATA cable works fine as I've put a mechanical HDD in it and it spun up fine and got recognized, I have put my SSD in my optibay and it was recognized but not booted, I can boot from my SSD in a USB 3 dock but I do not feel safe doing this due to no TRIM support. After doing all of this I stumbled across this thread and saw all the success stories and also the problems with mac not recognizing it due to the firmware, so I checked that my firmware was up to date by putting it into my PC and I can confirm it is up to date, so I'm very very confused what the problem could be now as it cant be the SATA cable, SSD, OS, Firmware, Controller, or the newly replaced Logic Board.
Help me guys, please.