i took apart this a1278 and now it wont turn on. it seems to get power and is fully charged, but i cant hear fans spinning nor the boot up chime. i have checked every ribbon cable for issues and all seems fine, also the battery seems fine.
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With any dead system you really need to trace out the power path from the battery to the logic board.
I would go back following the iFixit guide here MacBook Unibody Model A1278 Logic Board Replacement
I would walk it back to Step 23, Inspect each cable connector of damage. You either missed something or something got broken in the process
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The SATA cable is not pluged properly or try to disconect and reconnect fan cable or check if battery cable is properly connected.
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i checked. reconnected and ensured its on. both of the connectors are fine, i rechecked all and got it to boot with no os. for now, i think i need vm to make the installation media, because i cant do it directry from the “reinstall macOS” and im running on windows.
Ask a friend that can make the media for you and find a way to send to you.
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