Once you’re sure your Mac and its display are connected properly to a power source, the appropriate cables are connected, and the display’s brightness is at a reasonable level, it’s time to move on to more detailed troubleshooting. (Use the F2 key on your Mac keyboard, or the F15 key on a PC keyboard, to increase the brightness of your display.) If you’re not sure if the power is on, try plugging a known good device, such as a lamp, into the same plug that your Mac or display uses. Check to see if the power cables are plugged in, and make sure that any power strip or UPS that the display or your Mac is plugged into is also turned on.
Is the power turned on?: You already verified that the display is turned on, but you should also make sure that both your Mac and its display actually have power.
On non-Apple keyboards, the F14 (decrease) and F15 (increase) keys will adjust the brightness. 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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