I changed my MacBook's logic board to a 2009 one exactly one week ago, in order to gain compatibility with OS X El Capitan. Today, I was working on something quick using Logic and naturally, the audio was not good enough on the computer so I plugged in some headphones. They were a bit difficult to insert, but it didn't seem like I broke anything, it seems the connector just wasn't aligned well with the case. When I pulled them out and tried listening to that music quickly, the audio wouldn't come out from the speakers. Naturally, after seeing that the audio was disabled, I plugged my headphones back in and unplugged them after, but that didn't change a thing. I tried that a few times. I then went to the Internet and looked everywhere for a solution. Some recommended blowing inside, I tried that. Some recommended cleaning using a q-tip or whatever, I tried. Some said it was a software issue, I tried restarting, resetting PRAM, resetting SMC, booted into another OS partition, nothing worked. There is a chime though so it isn't the speakers. Finally, the most popular answer was that there was those connectors that needed to be pulled a bit because they become stuck. That's what I did. And I'll be perfectly honest, I think I went too far and broke it. Even though I completely pulled out the connectors, that did not work a slight bit! In fact, the red light kept lighting up all the time and the headphone jack doesn't actually work now, so what the hell is going on. Plus, one thing that was weird was that I kept receiving in my settings audio panel that the "Headphone" output kept changing to "Optical Output". If my computer detects that there is no headphone plugged in, why does it still pretend like it is? I'm confused. I've spent all night trying to figure this out. I need serious advice. I just changed my logic board, and I'm certainly not in monetary capacity to get another one. At least if I can get to force my OS to use the internal speakers no matter what, then I could maybe live with it. So please, if you will, please help me, I will greatly appreciate it!