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Answer to: MacBook Air not charging, not turning onHi Christian, I'd definitely check the I/O board first. It looks like the power from the charger isn't reaching the MacBook. Check the I/O board cable. If that doesn't help, I'd also check the battery. It's pretty unlikely though, because the MacBook should run off external power if a charger is connected, no matter if a battery is available or not. But you never know.