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3 groups of continues beeps stops on Apple Logo

i have a macbook 13 2011,

a1278 with 3 beeps and stops on Apple logo while installing OSX snow leopard?have you encountered this issue?i am pretty sure its not the RAM, i tried everything on the RAM. PRAM, reseat,replace, swapped etc to a new or working RAM nothing happens same issue,here is a thing, i tried to install the hard drive on my other macbook and boot the hard drive into it and it works perfectly fine, upgraded to 10.9 mavericks , I’m also sure that its not the disk drive either?i played dvd(AVATAR)on it after the upgrade and it works perfectly fine . tried to install a new hard drive with OSX Snow leopard? or prior OSX same problem, group of continues 3 beeps and cannot go through , only up to apple logo with continues 3 beeps, help help help….any idea will be appreciated. thank you

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3 beeps means a bad or lose RAM chip. You must have some working RAM or you'd see nothing.

Try one chip at a time.

If this answer is acceptable please remember to return and mark it.

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i have tried the RAM to a working Macbook and they are working fine, the 3beeps will start beeping after the Apple Logo and stops there, i did replace the RAM with a new one too and the same issue,just wondering if i replace the hard drive with OS already installed it is working fine, my problem is the 3 beeps will start beeping when installing OSX at first, like Snow Leopard, what i did is to install the OSX to a working macbook to at least 10.6.8 and then put it back to the macbook with 3beeps and it did works fine and i upgrade to mavericks, but i think this is not the fix or answer to the issue

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If you have exceeded Apples 8GB recommend RAM max it might be the installer doesn't like that

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the RAM are only 4 GB (2X2GB)

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Get the Ram type and speed of the RAM and the last three figures of his serial number and see if what he is trying to use will work in his machine.

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