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If your fans start normally, then progressively run up until they remain blowing at full blast, first suspect that the system is responding correctly to its control. Resetting its SMC is necessary to restore normal fan control. This affects the latest 2018 model with a T2 chip, when the Mac is connected to mains power at about the same time that its Power button is pressed to start it up. #SMC FAN CONTROL MAC MAVERICKS PRO#There is currently one rare set of circumstances in which an apparent firmware bug can cause a MacBook Pro to start up with its fans stuck running at full blast. If your fans come on full blast during startup, and don’t settle down, check systematically through these causes to discover what is wrong. ![]() Careful cleaning is vital to ensure effective cooling from the fans.
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