Mack book pro some Important 

1

Shutdown your Mackbook

Shut down your computer and disconnect all USB devices

2-

Press Comm.+shift+control

Reset PRAM and SMC

Reset PRAM and SMC

You might need more than a simple reboot to get it running smoothly again. This step-by-step guide will show you how to reset the PRAM and SMC on any Mac and explain why using a specialized Mac cleanup tool can help you avoid future performance issues.

After See the Apple logo,then Release the all command"

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Here’s how to reset PRAM on your Mac:

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1. Press the power button to turn on your Mac.

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A Hold down these keys for 20 seconds, during which time your Mac will appear to restart.guide to minimalism

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– On older Macs that chime on startup, hold down the keys until you hear a second chime.

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