(If you have a MacBook from 2009 or earlier with a removable battery, the SMC reset procedure is slightly different. Then, press and hold Shift + Control + Option + power button simultaneously for about 10 seconds. Press the power button to turn on the computer. Release all the keys and the power button at the same time. On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time. Unplug the power cable from your Mac and plug the power cable back in. Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected. These include something as small as the wrong display settings because of a third-party app you just installed or something as complex as a corrupted display or driver. Resetting the System Management Controller may help. The dreaded screen of death on your MacBook Pro or Air can be because for a number of reasons. If the battery on your Mac notebook computer is completely dead, you may need to give your computer a few minutes to recharge on an AC outlet before the device has enough juice to power on. Look at the power connections to make sure the power source is securely plugged into your MacBook and confirm the AC outlet is working.
Try to restart your Mac with these items unconnected. Disconnect any accessories that are plugged into your Mac, including printers, mobile devices, video displays, and USB cords. If the screen remains dark after you press the power button, try raising the brightness levels by pressing the buttons with icons that look like the sun located toward the left side of the keyboard on the top row of buttons (or the Touch Bar). There's a chance the display lighting level is turned way down.
To be clear, these are meant to be quick fixes to bring the system back to a fresh state, says Mel Yu, CR’s automotive analyst, kind of like hitting Ctrl-Alt-Delete on a Microsoft-powered computer. Occasionally, something more drastic needs to happen. Other times, simply turning the system off and on again can do the trick. Sometimes it can be as simple as unplugging your phone from the USB port and plugging it back in. Hardware reliability can be an issue with some systems, but we’ve found in our testing that in many cases there are tricks to getting them back up and running quickly. In fact, in our most recent exclusive Auto Survey, one of the most common reliability complaints from owners of newer models involved infotainment problems, such as when the display screen goes blank or freezes, or the navigation system stops working properly. And nothing sours that happiness faster than a system that refuses to cooperate or has a screen that goes blank.
For drivers who enjoy listening to podcasts and music or those who desperately need navigation help, a car’s infotainment system can be crucial to their happiness.
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