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Mensagem original de: lattestonetech24 ,

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RAM issues can cause a system to not start up at all. Usually there is a continuous set of 3 beeps that will let you know you have a RAM issue. You can check crucial's site and use the system scanner to see if the Crucial RAM you have is compatible with your MacBook. If it is, you might just need to reseat the RAM and try to boot up again. If reseating the RAM still doesn't work then the only other thing I can think of at the moment is a faulty RAM. You can check to see if one or both is bad by trying to boot up with one of the Crucial RAM at a time. Just put one on and try to boot up. If it boots up with one and not the other then replace the one that doesn't allow the MacBook to boot. If it doesn't boot up with either one, then get the RAM replaced and make sure you get one that is a confirmed match for your MacBook.

Here is what your MacBook will Support: 4GB (two 2GB SO-DIMMs) of 1066MHz DDR3 SDRAM; supports up to 8GB.

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