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Mid 2012 model, A1278 / 2.5 GHz i5 or 2.9 GHz i7 processor.

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Logic Board crash and 3 beeps on start up

A few months ago, I spilled some water on my MBP. Took it to Apple and they said that the water damage was confined to the logic board, magsafe adapter, and battery. Roughly $700 to fix it. Ouch. So I got the parts (battery and magsafe from iFixIt, stupidly got a used logic board elsewhere) and did the repair myself. It started working just fine for a while, but then I got a few kernel panic crashes (which have stopped happening now), but now it's artifacting across the screen with multicolored rectangles, crashing, then doing the Three Beeps of Doom. The artifacting tells me it's GPU and the place I got the logic board from refused to give me a refund. Still kicking myself over that. But the Three Beeps seems like a RAM issue. Should I replace the RAM first since I haven't done that yet?

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You can try doing that but it also might be a logic board or CPU problem. So there are no guarantees. Also, have you tried unplugging the battery from the logic board and wait a minute and plug it in again? This might help.

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I haven't done that, but I'll give it a shot. I have new RAM chips coming. If neither fixes it, I'll be ordering a logic board

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ok. Keep us up to date and I hope that fixes it!

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Any luck @alx710? I am having the same problem :(

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Sounds to me like the logic board you bought had inherit GPU issues and it just took awhile before they presented themselves. Reflow GPU (temporary fix and please, don’t bake it in an oven, use proper equipment/technique), reball GPU, or replace logic board.

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