Next up, wait for a few seconds and then press the power button to turn on your Mac. Make sure to hold all the four keys for another 7 seconds and then release them all. After that, press and hold the power button as well.Next, press and hold the Control, Option (Alt), and Shift keys for 7 seconds. Hence, resetting it may help you overcome this issue. For those uninitiated, SMC is responsible for managing the behaviors of several key components including power (power button and power button to the USB), battery and charging, fans, indicators/sensors, and more. No solution as yet? No worries, try resetting SMC (System Management Controller) on your Mac. Be sure to hold these keys until your Mac restarts and you hear the startup sound again.Then, hold down the Command, Option, P, and R keys at once immediately after you hear the startup sound.After waiting for a few seconds, turn on your computer. To get going, turn off your Mac (Intel-based Macs).Resetting PRAM/NVRAM can often let you resolve common macOS issues. PRAM (Parameter RAM) is also designed to store similar settings. NVRAM (stands for nonvolatile random-access memory which your Mac uses to store certain settings including display resolution, sound volume, time zone, startup disk selection, and recent kernel panic information. After your Mac has rebooted, reconnect the USB devices to see if the problem is gone.
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