3 Is this the logic board?
Hello! I have a Imac from late 2012, and it randomly shuts off. I have a feeling its the logic board, but i'm not sure. It has done this a lot, when it does it i have to switch wall outlets to get it to turn on again, not sure why. after its done booting, it says no error message like "Your mac shutdown because of a problem." it used to give me these messages, but not anymore. it is completely random, i can be playing a Video game or just watching Youtube, its random. and its not like a crash because it just shuts off, like it wont say shutting down the screen just goes black and its off. Any help is appreciated!
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It has other symptoms besides shutting off? Like lines on the screen. When you get close to your iMac do you hear a buzzing sound (i'm not talking about the spinning sound of the hard drive).
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