Early 2011 model, A1278 / 2.3 GHz i5 or 2.7 GHz i7 processor.

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Have installed a new HD, when I insert the Snow Leopard disc

When the disc snow leopard is in I get a series of three beeps . How do I get it to boot up.

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The tree beeps are a RAM error. Try resetting g then RAM, one at a time in each slot to test both the `RAM and the slots. Have you changed it?

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