This is the last step you should try before taking your Mac in for a repair. On a desktop Mac, unplug the cable and wait ten seconds. If your Mac is running, it'll cut the power and force it to restart. On a modern MacBook, press the power button and hold it for ten seconds. Plug in your peripherals after a reboot and see if it all works properly. Unplug all peripherals except your keyboard and mouse, then try to boot. There might be a problem with your accessories.Also, try raising the monitor brightness to make sure that it's not turned down extremely low. Check the video-out cable connection with the external display (if any).Next, check the wires for damage and try a different charger or cable. Check the power connections to make sure they're secure on both ends.Instead of panicking, try these steps one at a time to diagnose the problem: There's no power light, no sound, and a completely black screen. You press the power button on your Mac, and nothing happens.
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