![]() However, the above method of disconnecting and reconnecting MagSafe while holding the Power button was successful in starting up the Mac – with fans running at full speed and at reduced clock speed however. ![]() Once the battery was removed you can press the power button but nothing happens. I experienced this scenario on an old MacBook Pro 2010 model after removing a swollen battery. ![]() The only way to stop the fans from running at full speed and to return the clock speed to regular performance is to install a new battery into the MacBook Pro. When the MacBook Pro does boot, the fans will be blasting at full speed for the entire time you are using the Mac ( resetting SMC or PRAM does not stop the fans running, only replacing the battery will).Īlso it appears that the MacBook Pro will reduce its own clock speed in this situation, thereby reducing performance.
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