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Ursprünglicher Beitrag von: Dan ,

Text:

Three beeps is a memory error! Reference here: [https://support.apple.com/en-us/HT202768|If your Mac beeps during startup]

Reference this [https://support.apple.com/en-us/HT201165|MacBook Pro: How to remove or install memory]. Find your system and check to make sure  your modules are the correct ones for your system. You may need to get a fresh set to test your system.

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