You've seen Fast 'N' Loud we do that for desktops and laptops!
If you are like me you like thing to go fast. Cars, bikes, lawn tractors, and the occasional zero turn I like them to go fast and loud! However, with a computer or computing device everyone wants it to start quick, move quick and be as quiet as it can and still do the jobs reliably. If you also like things to look different from the standard way everyone else's items look I can do things custom. If you don't like the green light on the power button and you want it white and bright then if I can get that color led then I can change it. If it is too small or might cause the device to not work then we'll need to leave it. What am I saying a larger size is always easier to work on and customize. I like AMD APUs and Intel SOCs because they run quicker, can do more with less and can be built smaller. You now can have a powerful PC in the space of a shoe box if you choose.
Antwoord op "What else could it be!?"Like Mayer asked, "Did the SSD ever work when you placed it in the laptop?" Secondly before you shut the machine down were you able to clone the old hard drive to the SSD using a software like carbon copy cloner? The software is free however the use may be limited. I have done multiple configurations on both of my mac an iMac 2009 and a MacBook Pro (RAID-0 with backup by Time Machine daily, RAID-1 this all with a OWC data doubler and two sats 3 SSDs of 240 GB each.) I take it from your post and I am insinuating this that you failed to clone the previous drive. One idea with further reading of your post try to create a usb install drive with the Disk utilities and everything to install OS X on your SSD. There are instructs on the web mind you Google is your friend. And the whole process should only take you once you find the instructions and figure things out about 30minutes to an hour depending on the size of your Time Machine backup (a fresh install is better on those era MBPs). Also good luck on your...