Answer to: Logic board fried or my magsafe dc input?Hi there, I’ve got exactly the same problem. The battery was at full charge when the MBA was turned off. Now it won’t turn on. I have checked the battery with a voltmeter and it has plenty of juice in it . Macbooks should work without a battery if the charger is plugged in. If you unplug your battery from the logic board and you can boot up, then your battery is dead. If you disconnect but can’t boot up, then the problem is going to be a lot more expensive to fix.