Reconnect battery and MagSafe power adapter.Press and hold Power button for five seconds.Disconnect the connected MagSafe power adapter from computer.If it is a portable Mac with a removable battery Resetting SMC varies depending on your Mac. Resetting System Management Controller (SMC) Luckily, there are various solutions that you can try to fix a Mac that won’t up on macOS 11. Computer may also fail to respond to the power button when pressed, or may shut down or sleep unexpectedly. The System Management Controller may cause unusual system behaviour like high speed fans, despite Mac not having heavy usage. macOS 11 refusing to wake up from sleep mode could be due to power management problems or hardware-based configuration fault. The first step in learning how to fix your Mac not waking from sleep on macOS 11 is understanding the problem. How to Fix Your Mac Not Waking from Sleep on macOS 11 This article will show you how to fix a Mac that won’t up on macOS 11. In such a situation, you will wonder what you should do if your Mac won’t turn on. When you return and wake your Mac, the system may refuse to respond to key presses and hence won’t wake from sleep. To avoid closing certain programs, you will have to put your macOS 11 on hibernation or sleep mode, so that you can continue from where you left off when you return. When using your Mac, other urgent matters may arise that need your immediate attention.
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