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My Macbook Pro (mid 2012) unexpectedly shutdown on its own last night. Everything seemed to work fine all along until then. But now cant charge my machine. Cant even switch it on. Initially i thought my battery may be too low. So rushed to get my laptop charger. But for some reason it refused to charge my Macbook. Can see a just a dim green light on the head of the charger . But no success in charging the machine. I have tried resetting the SMC without any luck. Another strange observation, there appears to be a continuous low level noise from the base of the laptop (not sure its the fan, hard disk or any other circuit board). The laptop has been disconnected from the charger last 12 hours. But still can hear this static noise ( similar to low level buzzing or an old vinyl record stuck). It is hardly audible but very much present when I hold it very close to my ear.. I find this noise very unusual. Why should this happen even with no charger connected. By now whatever little battery I had charged before the laptop crashed should have discharged. There has been no kind of liquid or external damage as far as I remember. Kindly suggest possible solutions. Thanks in advance.
I would first make sure your MagSafe charger is in good shape, review this Apple T/N Apple Portables: Troubleshooting MagSafe adapters If your cord or connector are worn you really need a new unit. Sadly there are a logic fo fake ones on the market so you do need to be careful as these fake ones can damage your system OEM MagSafe Chargers vs Cheap Imposters: Teardown for Truth & Don’t Replace Your MacBook Charger With a Cheap Knockoff Let’s move on to your system, a common issue is the DC-In board one wire circuit gets shorted out. If you are lucky thats all you’ll need to replace here MacBook Pro Unibody 13" and 15" MagSafe DC-In Board If that doesn’t fix it then sadly your systems logic board has a problem with the power control logic. Here’s how to replace the part MacBook Pro 13" Unibody Mid 2012 MagSafe DC-In Board Replacement
