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. 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.
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Use the F2 key on your Mac keyboard, or the F15 key on a PC keyboard, to increase the brightness of your display. Press and hold the power button for about 15 seconds; this will ensure that the Mac is indeed turned off.
If your Mac won't turn on
The next step will be to turn your Mac on. When you perform this step, you want to carefully listen for one or more of the following sounds. First, listen for the Mac startup chime. If your Mac is earlier than a late model, it should produce a startup chime. If you have an attached keyboard, you can try pressing the caps lock key to see if the caps lock indicator light turns on, indicating there is power present at the keyboard. If you find no evidence of the Mac turning on, try the test again using a different power cable, a different outlet, or bypassing any power strip or UPS you may be using.
For MacBook users, make sure the battery is charged. You may need to leave your Mac plugged in to charge the battery if it was fully depleted. You already performed a basic power cycle when we started this sequence of tests by holding down the power button for 15 seconds.
This time, however, the sequence is slightly different. Hold down the power button for 15 seconds to ensure your Mac is turned off, then unplug your Mac from any electrical outlet and wait 30 seconds. Plug your Mac back in, turn it on, and listen for any of the startup noises we mentioned earlier. There can be a number of issues that can prevent your Mac from completing the startup process. One of the first steps I suggest performing is to disconnect all of your peripherals, except for the display, mouse, and keyboard.
This includes any external drives, printers, expansion boxes or hubs, as well as any cables associated with them that are connected to your Mac. Once everything is disconnected, restart your Mac. At this point, the task is to try each item, one at a time, to discover which one is causing the problem. If a problem is detected, your Mac emits one or more tones, or it may blink certain indicator lights to reveal what the issue may be.
One tone, repeating every five seconds: No RAM installed. Three tones, then a five-second pause before repeating: Possibly indicates failed or poorly installed RAM.
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Three long tones, three short tones, three long tones: Your Mac will attempt to auto recover from this condition. Do not interrupt the process; once recovery is successful, your Mac will restart on its own. At this point there should be some signs of life, such as the Apple logo or a progress bar being displayed.
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- 3. Perform the special power cycle.
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You may still need to perform some of the steps below to allow your Mac to finish the startup process. There are a number of possible issues, including no startup disk being found, a startup disk needing minor repairs, a startup disk gone bad, or a few basic Mac settings that need to be reset after all the fooling around with power and POST issues. The NVRAM holds basic configuration information your Mac uses at startup, including display settings and which startup volume to use.
The SMC controls sleep settings, power functions, battery control, and quite a bit more. You can reset these essential controls using the Rocket Yard guide: These two special startup modes can help resolve some common issues that can plague your Mac and keep it from starting up. They are especially useful for fixing minor drive issues that may be causing your Mac to fail during the startup process.
You can find instructions for using them in the Rocket Yard guide: The screen should light up normally right after that.
1. Check If the Mac Has Power
Try this in a dark room for greater effect. System Management Controller is responsible for many ground-level functions of your Mac. Among those are battery settings, display reactions, and specifically the Power button functions. Putting hardware-related issues aside, there would be still many explanations for your Mac's misbehavior. But to give you a perspective, here are a few more ideas to check:. Luckily, all these problems can be fixed using just software solutions.
To get a health check for your Mac, start with a simple maintenance tool for Mac — a program of CleanMyMac type will do. It could help you locate hidden junk files and detect various hard drive errors which prevent your Mac from booting up. Most often than not, a quick digital garbage cleanup will do the job.
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