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There's no way to know from a simple visual examination. You have three options... [the cavalier] Try it & see what happens [the circumspect] Take it to be tested [the disposable income] Buy a new one & throw that one away.


I just did what AdamJ said, took my magsafe adapter off and clean it up with a toothbrush to remove dust. It really worked and now my thunderbolt display is charging my macbook pro! :)


Keeping your Mac plugged in 24/7 is dangerous and will shorten the life of your battery exponentially. From imploding to starting a fire, you should only plug it in when needed. A while back I lost everything when I left my Mac (which was bought recently) plugged in for the week I went to Italy. The battery imploded and I was unable to retrieve anything. For ...


No, not at all. I leave my MacBook Pro connected to the charger for days on end sometimes and the battery still works fine. Once the battery gets to 100%, if it is still connected to the charger the MacBook stops charging the battery automatically and allows the battery to go down to 97%, then allows the battery to charge back to 100%, and repeats that cycle ...


Apple recommends not leaving it plugged in all the time. This can damage the battery over time, as lithium-ion batteries need to be frequently discharged. If you are going to use an external monitor, why not buy a desktop computer? MacBooks are made to be portable and have their batteries used.


I had a similar thing happen to my old Macbook. I discharged the battery all the way down and then couldn't recharge it for about two days. When I finally could charge it, it wouldn't charge or turn on. It turned out to be the battery. You can probably get a replacement battery from Apple (if it turns out to be the battery), but I found cheaper options on ...


Your charger is not the issue as evidenced by your testing it on other MacBook Airs I've tested the charger with multiple other MacBook Airs, and the charger works fine. You have a problem with either your logic board and/or your DC Power I/O Board. You need to take it in for service.


If you can at least start the Mac up and make the battery lights flash, it's lint. Here's how you clean lint from a port: Get a toothpick. Stick it in the port. Carefully rub the inside of the port. Pull out the toothpick. Repeat.


Apple makes 3 different chargers for their MacBooks that you need to be concerned about: 45-Watt -- For MacBook Airs. 60-Watt -- For 13" MacBook Pros. 85-Watt -- For 15" and 17" MacBook Pros. You can use a higher-wattage charger than you MacBook requires, but not a lower-wattage one. Yours was an 85-watt charger. If your friend's charger was a 60-watt, ...

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