Released June 2012, Model A1278. Intel processor with Turbo Boost, Up to 512 MB DDR5 Video RAM

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My computer makes three beeps

It works last time but when I turn it on it goes beep beep beep pause beep beep beep and the lights flash help me!!!!!!

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This is a RAM issue. First reseat the RAM models. Here's how:

MacBook Pro 13" Unibody Mid 2012 RAM Replacement

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Well after a few days it turned on and the screen has random lines and after that it turns off and beeps 3 times again. Mayer help me

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Did you reseat the RAM? Try one stick at a time in each slot to test both the slot and the RAM. Tell us your findings.

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