Replaced Blu Ray Drive not working

So I bought a used PS3 slim that had a blu ray drive that didn't play games, but it would play dvds. I bought it because it seemed like an easy fix and it was cheap even though it was missing all of the screws. So I bought a blu ray drive from someone on Craigslists and I replaced it in the PS3 while making sure that I used the PCB board from the old blu ray. When I turned it on, it didn't play any disc and it didn't ever try to read the games. So I decided to use the old drive but use the lens from the newer blu ray drive. At first it read the game, but when I tried to play the game it froze, gave me a blinking green light and now it no longer reads ps3 games, but it will read dvds again. My question is did I need to do something with the newer blu ray drive so that it works, or is there something I can try with the ps3 slim now.