On an Apple-supplied keyboard, including those built in to a MacBook, the F1 (decrease) and F2 (increase) keys are used to adjust the brightness. Regardless of who was responsible, if it’s loose, you need to reconnect the cable firmly at both ends.Ĭheck that the display’s brightness is turned up to a reasonable level: This applies to both external displays, which will usually have one or more buttons on the monitor to adjust the display (check the monitor’s manual for instructions), and those built in to your Mac. If either cable is loose or unplugged, the dog did it at least that’s what the cat always says. If you’re using an external display, check to make sure it’s turned on: While you’re at it, make sure the video cable is seated properly at both the display and the Mac ends of the cable. I suppose this step is a bit out of order from a logically flowing troubleshooting process, but hey, it’s the simple stuff that most often causes these types of problems, so let’s start there. We’ll start our troubleshooting by checking a few basics. Let’s take a look at the possible causes of a moribund Mac, and what we can do to fix them. But after a minute or two, you start to think something is dreadfully wrong with your Mac. That’s OK you know it can sometimes take a little while for your Mac to boot up. You just turned on your Mac and all you see is a dark display.
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