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MacBook wont boot after RAM change

I bought a pair of 4GB Crucial DDR3 - 1333 (PC3 10600) ram memory, I installed it but when I turn on my Mac, it doesnt start, the screen is black and emits a beep. I tried changing positions, but nothing, when I mixed one crucial and one stock ram memory, boots normally, tried with both sticks and starts normally, but Im losing 3gb of memory, what do you recommend me?

PD: Sorry for my english, Im not a native speaker.

PD2: Its a unibody MacBook White 13" mid 2010 with OS X Lion 10.7.3

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Your machine uses PC3-8500 DDR3 Min. RAM Speed: 1066 MHz

It appears you have gotten RAM that's to fast for your machine.

http://www.everymac.com/systems/apple/ma...

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7 Comments:

thankyou, but why one ram works but not the two, shouldnt both or none work?

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The RAM bus is now independent of the CPU FSB (front side bus). The RAM bus speed is determined by the slowest chip/stick installed and the crystal setting the bus pace. Thus it makes perfect sense for both old chips to work and/or 1 new with 1 old, but not both new chips of the wrong speed to work. On most modern computers the memory controller has moved off the Northbridge.

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I guess I can sell a friend the other one, but, there's no problem using just one and one?, I mean, In mot going to nave any problems by using one 1333 and one 1066?

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I would sell both new chips and purchase 2 of the correct speed. You will get better performance out of your system.

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I cant return it, it was a gift from a friend in the usa, Im in southamerica, It wont get unstable if I left one and one?, sorry for insisting

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Juan David will be eternally grateful.
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