Macbook Motherboard replacement
MacBook Pro 13" Unibody Early 2011 Logic Board
Mac would not sleep when lid was closed and disk access was slow
MacBook Pro 13" Unibody Early 2011 Hard Drive Cable
"No audio, and no "Internal Speakers" in SystemPrefs>Sound>Output"에 답변Sounds like you might have damaged the headphone connector. The mac detects if a plug is in the jack and disables the internal speakers if it thinks one is in there. I had a system where the tip of the headphone jack broke off in the connector. It took a bit of work to get the tip out.