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Modelo A1278 / 2.26 o 2.53 GHz Procesador Core 2 Duo EMC 2326 de mediados de 2009

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continues single beep every 4 seconds

The screen stays back and I get continues beeping every 4 to 5 seconds. The only thing that I am able to see is a white flashing light on the right edge of the chase. I have read some post and they say it’s the memory. I have replaced the memory and still no go. I know the old and new memory works just fine because I have tested it on a different MackBook Pro. I know the hard drive is good as well because it works on a similar laptop.

Any suggestions? I think it’s the motherboard?

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How many beeps? The number of beeps it makes each time relates to a "beep code", which can tell you something about what's wrong. Or is it making a solid tone, and not discernable individual beeps?

Have you tried resetting the PMU/SMC and the PRAM?

It's a longshot, but it could be that the power button is stuck, causing the power-on sequence to repeat continuously. To rule out that and the topcase/keyboard/power button assembly as the problem, I would disconnect the ribbon cable attaching it to the board, and then trip the power by bridging the power-on pads on the board. If the behavior is the same, you know it's not the topcase/keyboard that is the problem, and if it resolves the issue, you know the problem is somewhere in the topcase.

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Sometimes you can have problems with one of the two memory slots. Try booting with a single stick of memory you've tested in another machine, first in one slot and then in the other.

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I did try that and same problem. no luch.

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I am having a similar issue. With both RAM sticks inserted, I get three beeps at startup. I tried taking one stick of RAM out and I still had 3 beeps. Then, I switched the RAM and removed the second stick of RAM, I got no beeps but still just a black screen during boot-up. The light turns on, but that it it. Any help is greatly appreciated! I just want to retrieve my files!

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