原帖由： Dan ,
Please review this Apple T/N: [https://support.apple.com/en-us/HT202768|About Mac startup tones] The beep error you are getting is a RAM error. Most likely the logic board upper RAM socket is damaged. This often happens when the system gets a good bang on the bottom cover. Lets try this take the top module out and see if it runs with only one module. Also you may want to check your modules as you can get this error if the modules don't meet the required specs: 204-pin PC3-8500 (1066 MHz) DDR3 SO-DIMM I would start their I would not try desoldering anything as your issue is clearly a RAM issue based on the POST error and we have seen this problem before.