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Jun 7, 2015 5:08 AM in response to gaurav.prideby Mike Sombrio,If you're sure that you're using good quality, compatible ram, it's likely that you have a hardware failure. If you're just swapping sticks you may have laying around from a different computer or getting the cheapest stuff you can find that's not going to work.
Make an appointment at your nearest Genius Bar or AASP and take your MacBook in for a diagnostic and estimate.