![]() Release the Power button, reinsert the battery, plug in the Mac, and press the Power button to turn it back on. ![]() Press the Power button and hold it down for five seconds. ![]() With older MacBooks with a removable battery, unplug the Mac from its power source and remove the battery. Plug it back in, wait five more seconds, and then press the Power button to turn the Mac back on. Mac desktops don’t have batteries, so unplug the Mac’s power cord and leave it unplugged for fifteen seconds. Release all four buttons at the same time, and then press the Power button to turn the Mac on. Press the Shift+Control+Option keys at the left side of the keyboard and the Power button, and hold them all down. On current MacBooks without a removable battery, plug in the power cable. ![]()
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