Mid 2010 Model A1278 / 2.4 or 2.66 GHz Core 2 Duo processor

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How to fix MacBook freezing on the start up

i've tried to upgrade my macbook pro 13 model mid 2010 from 2pc 2 gb ram to 2 pc 4 gb ram of kingstone,but it fails to boot up,when i remove one of those 4 gb and mount the the 1 stock 2 gb nothings go wrong,so for now im running 6 gb ram and i've noticed that it not ok to run with the 2 pc of ram but not equal,

i need someone can help me or give me an idea to reolve this problem...

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Your computer should run with 8 GB of ram. Are you using PC3-8500 memory? It should do no harm to run with 6 GB ram. Good luck.

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