Yesterday I took in my early '11 17" mbp in to get the headphone jack fixed. One of those little sensors are stuck in and when I put my headphones in, it goes to optical out mode. I think he was going to fix it there, but I mentioned I hadn't made a full backup in 2 weeks. He said go home, back up, bring it in tomorrow. I did. Today, she hooked up the computer to her network diagnostic. Bamm.. no optical drive. I told her I had it swapped out and had an ssd+the original drive. She said she they couldn't fix it in that state and she was doing me a favor by not voiding the warranty. Also, she mentioned that the optical drive is not a serviceable part and swapping it out with anything voids the warranty. I have a three year extended on it (making it a $3K machine). What irks me is the guy yesterday knew about the swap out and said, "oh cool". Just depends on who you get I guess. So, I'm going to swap the optical drive back in and see how it goes tomorrow. I am wondering if they can even do motherboard swap outs at the retail locations or if they will have to send it in. TL;DR: If you take your optical drive out, put it back in before you go to the "genius bar" of they will threaten to void your warranty.