How does Apple or any Apple Authorized Service Provider know if you have opened up your macbook pro yourself? I know once you open it up you void your warranty... but how would they know that you did?
The problem is, my macbook pro (2011) was fixed a during the summer by an authorized repair provider, the whole logic board was replaced for free because my mac was still under warranty. I recently swapped out the optical drive because it was useless, and added an internal hd in there. A month later (couple days ago), I inserted my headphones into my audio jack, and when i pulled it out, there was a red light. Now, the audio preferences for mac keeps staying under digital out (optical digital-out port) when i don't have my headphones in there, and when i do, no sound comes out of the headphones. The weird thing is, there is absolutely no problem when i am boot camped into windows, headphone works fine, the laptop produces sound just fine as well.
I feel like its both a software (mac part) problem and a hardware problem (red light). What can i do?
Also, i replaced my hd back to the optical drive just in case i would need to take it to a service provider. but my question is, how would they know if the mac has been opened up before? Can they void my warranty on the spot?