Many of you have probably heard that Apple's operating system is famous for its reliability and the low number of errors and failures that occur during operation. However, Mac OS, unfortunately, is not perfect and one day it may simply not boot for no reason at all.

Without a doubt, this behavior of your Mac can be caused by a number of different errors, which need to be eliminated in different ways, but the author of this article has recently increasingly encountered a situation where MacBook won't boot after latest update operating system (Mac OS Sierra in this particular case) and makes three loud squeaks, repeated with a certain frequency.

Unfortunately, this can happen to any of us, and contacting a service center is often not timely and, of course, not cheap. Luckily, there's an easy method worth trying before you take your Mac anywhere. Judging by the reviews on foreign forums, it helped many people save money on using the service, and such a “hint” has helped the author of this article more than once. About him and we'll talk. So, what to do if your MacBook won't turn on?

Error appearing when booting Mac

As mentioned above, a computer can behave in a similar way due to a number of different errors (at least 4, judging by the help on the Apple website).

However, in our case, the sequence of actions and the patient’s symptoms look like this:

1. you have installed an update to the Mac OS operating system (or the computer installed it itself if you have auto-update enabled);
2. when you turned on (rebooted) your MacBook, instead of the expected operating system loading bar, you saw only a black (well, slightly gray, the side backlight of the monitor still turns on) screen;
3. Looking at this “light black” screen, you heard three long sounds like “beep-beep-beep”, repeated at intervals of 5 seconds.

Having carefully studied the official Apple website, we find the symptoms and description of our error:

"Three consecutive beeps, repeated with a five-second pause: RAM has failed the data integrity check."

Okay, I see, it's a RAM error on our MacBook. But the officials somehow forgot to offer any solution. But we found it, and it turned out to be as simple as shelling pears. Of course, it’s not a fact that this method will help you 100%, but it’s worth a try, because... for many it is works.

By the way, judging by discussions on foreign forums, the following MacBook models most often give this error and do not turn on: MacBook Air a1466, MacBook Pro a1278 and a1260. It is from the first that we are writing this article.

Solving the problem - resetting SMC parameters

So if your MacBook Air, MacBook Pro, iMac, Mac mini or Mac Pro won't turn on and beeps- This indicates a random access memory (RAM) error, which can most often be resolved by resetting the System Management Controller (SMC).

Depending on what device you have, follow one of the algorithms below.

If you have a MacBook with a non-removable battery

And most modern models are like this, then the algorithm of actions for you is as follows:

If you have a MacBook with a removable battery

Although, in my opinion, these have not been produced for a long time, but just in case, we proceed as follows:

If you have an iMac, Mac mini, or Mac Pro

That is, one of Apple’s desktop computers, then resetting the system management controller (SMC) parameters is even easier:

Using the method appropriate for your Mac, you will most likely see the usual Mac OS loading window - this means that the problem is solved.

What does resetting SMC affect?

If you are not very knowledgeable about computers or are simply encountering such a procedure for the first time, then before performing the steps described above, a completely reasonable question may arise: “Will I lose important data or settings on my MacBook as a result of resetting, because this procedure is somewhat similar to "hard reset" on some gadgets?"

We hasten to reassure you - no, you will not lose anything important. If you are really interested, then take a look at the list of functions for which the system management controller (SMC) is responsible, the parameters of which we reset:

• response to pressing the power button;
• response to opening and closing the display lid on Mac laptops;
• battery resource management;
• temperature control;
• sudden motion sensor;
• ambient light sensor;
• keyboard backlight;
• status indicator control;
• battery status indicators;
• Select an external (rather than internal) video source for select iMac displays.

Alternative option - rearrange the RAM

If the above option didn’t help and your MacBook still won’t start, then it’s worth a try alternative way. However, it is not suitable for any Mac computer, but only for those whose RAM can be replaced, and not soldered onto motherboard(as is done in most modern Mac models).

If you have one of these computers, then this option may well help you, you just need to know how to get to the slot random access memory. The algorithm of actions is very simple:

That's all. Now you know what you can try first if your Mac won’t start and beeps with a nasty signal. We hope that one of the options suggested above will help you solve this problem and save a significant amount of money on contacting a service center.

If your Macbook won't turn on, there's no reason to worry. According to experts service center Macrepublic, every second Apple laptop, which suddenly turned off and does not want to turn on, can be easily reanimated at home.

Our advantages

Let's take a closer look at how this happens.

Check monitor

First of all, you need to rule out a display malfunction. Perhaps the Macbook Pro screen does not turn on, but the rest of the system devices are working properly. If during startup you hear the noise of the fan, the display works and the melody of loading the OS is heard, but the screen remains black, it means there is something wrong with it. The problem can only be fixed at a service center.

Check power

Most common cause The fact that Pro, Air, Retina, Macbook does not turn on is the lack of power. Therefore, if such problems arise, perform the following actions:

Check the connections between the power cord and the adapter and outlet.

Make sure the outlet is working.

Recheck the cord and adapter on other devices.

Check the integrity of the charging plug. Clean it from dust and debris.

Eliminate the possibility of battery failure

Other ways to turn on Macbook

A malfunctioning controller or memory modules can also cause your Macbook to not turn on. Rebooting and completely turning off the power for 10 seconds will help resolve the failure.

If Pro, Air, Retina, Macbook does not turn on, you can try resetting the system management controller parameters. The reset is performed by synchronously pressing the “Option”, “Control”, “Shift” and “Power” keys. In this case, the power cord must be connected to the laptop, and the buttons must be released simultaneously. After that, you can try to turn on the MacBook again.

Another way to proceed if the Macbook Pro screen does not turn on is to restart the PRAM/NVRAM. Restarting is done by pressing and holding the Power, Option, R and P buttons until the black screen turns gray and the reboot occurs.

A power surge or power failure can also cause your MacBook not to turn on. Power control is carried out by “Power Manager”, which blocks the laptop from turning on. The following actions will help you disable the manager's action: When the MacBook overheats, a shutdown is also observed. You can turn on the device only after it has completely cooled down.

• disconnect the gadget from the network;
• remove the battery;
• press the “Power” key and hold for 5-10 seconds;
• insert the battery back;
• try turning on the laptop again.

1. When the MacBook overheats, a shutdown is also observed. You can turn on the device only after it has completely cooled down.

   If Pro, Air, Retina, Macbook does not turn on after updating, download to safe mode, holding down the “Shift” button during startup.

Let's not talk about Apple's reliability for the 100th time. Everything breaks.

But this case is strange, almost paranormal - at least it seems so when it happens to you.

Given: a new MacBook in excellent condition and without repairs. Sit and work on it. Suddenly, it turned off. Without warning, the screen went dark and the power went out.

You try to turn it on, but it doesn't respond at all. No way. Long press the power button, connect the charging cable, change charger. Just zero reaction.

Don't rush to go to the service just yet. And don't rush at all. Perhaps this problem can be solved right now.

I experienced my Mac suddenly shutting down 2 times in 1 week

I believe in coincidences, so I think I was just “lucky.” But any of you could be in this place.

A week ago, a colleague of mine experienced the above problem on his MacBook Pro. The computer simply turned off out of the blue and no longer showed any signs of life. Tried it different charges, cables, open and close the lid. Useless.

A few days later the situation repeated itself with me and a 12-inch MacBook. Only the circumstances are different.

I didn't have a sudden blackout. The MacBook had 2% charge left when it went out. I didn’t think anything bad, put it in my bag and forgot about it. In the evening I put it on charge.

I open it in the morning, try to turn it on - zero reaction.

The laptop just seemed completely dead. It’s a strange feeling – just there was a computer, and now there’s a piece of metal with buttons. And it seems like it’s not your fault.

If something like this happens to you, don’t despair: most likely it’s a glitch SMC controller.

What is an SMC controller, why is it needed?

Literally, SMC stands for System Management Controller, that is, a system management controller.

This is a chip on the motherboard that solves several specific problems. Quoting the official Apple website, SMC is responsible for:

• response to pressing the power button
• response to opening and closing the display lid on Mac laptops
• battery resource management
• temperature control
• operation of the sudden motion sensor (SMS)
• ambient light sensor operation
• keyboard backlight
• status indicator control
• battery status indicators
• Select an external (rather than internal) video source for select iMac displays.

SMC controllers are found on all MacBooks with Intel processors. Under ideal operating conditions they function without problems.

But for some, SMC may begin to become dull. The cause cannot be guessed or diagnosed at home. These may be problems after an unsuccessful update or system restore from backup, or voltage surges in the electrical network when recharging the battery. Or something else.

If the cause of the SMC controller failure is extremely difficult to determine, then you will notice the problems themselves almost immediately.

Again, we turn to the official Apple website for a list of situations that require resetting the SMC controller:

• The computer's fans are spinning at high speeds even though the computer is not heavily loaded and is properly ventilated.
• The keyboard backlight is not working properly.
• The status light (if equipped) does not light up correctly.
• Battery indicators (if present) do not work correctly on Mac notebooks with a non-removable battery.
• The display backlight does not respond correctly to changes in ambient light.
• Your Mac doesn't respond when you press the power button.
• Your Mac laptop doesn't respond correctly when you close or open the lid.
• Your Mac suddenly goes to sleep or shuts down and then can't turn on.
• The battery is not charging properly.
• Your MacBook or MacBook Pro won't charge using the built-in USB-C port.
• The MacBook or MacBook Pro computer does not recognize external devices connected to its built-in USB-C port.
• The LED indicator on the MagSafe power adapter (if equipped) does not correctly indicate the current charging status.
• Your Mac is running unusually slow, even though it isn't experiencing excessive CPU usage.
• Your Mac that supports Shared Display mode doesn't switch to or from Shared Display mode as expected, or it switches unexpectedly.
• Illumination around the I/O ports on Mac computer Pro (Late 2013) does not activate when moving the computer.

Normal, right? Reading this list in its entirety makes you want to immediately reset the SMC settings on your Mac, no matter how it works. Suddenly it will get better.

Fortunately, the SMC reset procedure is safe, does not lead to negative consequences, and is often used by Apple service centers as the first step in resolving owner complaints. No data or settings will be lost. All files will be in place.

As you may have guessed, it was the SMC reset that helped my colleague and I revive our MacBooks. Only the procedure turned out to be not as simple as it was described on the Apple website.

How do I reset SMC on my Mac?

If you have a MacBook with a non-removable battery: Turn off your MacBook (if it's on), hold down the CMD (command) + Option (alt) + Shift keys on the left side of the keyboard, and press the power button with your other hand. Keep it all pressed for 10 seconds, then release. Turn on your Mac as usual.

If your MacBook has removable battery: throw it away, it's time to upgrade. Okay, seriously, you need to turn off the beech, remove the battery from it, hold down the power button for five seconds, then release, insert the battery pack back and turn on the laptop normally.

If you have a desktop Mac, iMac, and Mac mini: turn it off, unplug the power cable, wait 15 seconds. Insert the cable back. Wait another 5 seconds, turn on as usual.

If you have iMac Pro: turn it off, hold down the power button for 8 seconds, release it for 2 seconds and then just press.

Mac computers give no indication that the SMC settings have actually been reset. If your problem is not solved, although it is mentioned in the reasons to reset, try again. Once again.

Damn it, try ten times. Because for some unknown reason it very rarely works out the first time.

Personally, about the sixth attempt brought me success. The Mac suddenly turned on, began charging and generally acting as if nothing bad had happened.

What if resetting the SMC didn’t help and the Mac still won’t turn on?

I highly recommend trying to reset SMC at least five times. This observation is confirmed by numerous topics on Western forums. For some reason, the keyboard shortcut window is very small on newer MacBook models.

Apple computers are highly reliable, but their owners sometimes run into trouble. Let's figure out what needs to be done when the MacBook does not turn on. If you didn’t manage to flood your laptop and didn’t drop it on the floor, the problem can most likely be solved without going to a service center.

First, you should perform an external test to ensure that the monitor and power adapter are working properly. The first applies more to Mac Mini owners and all-in-one iMac. Laptops manufactured before 2016 use a MagSafe magnetic port for charging. Its power cord is equipped with an indicator light.

At correct connection it should glow orange or green. The L-shaped magnetic latch can operate even if the contacts have not yet connected. In this case, the power cord is externally connected, but due to slight misalignment, power is not supplied. The latest generation of T-latches do not have this drawback. Make sure MagSafe is connected correctly.

All 12-inch models, and after 2016 – the MacBook Pro, use a power supply with a USB-C connector, which does not have a light indication. MagSafe remains only in Air. The cord of the new adapters has two identical connectors at the ends and connects to the laptop and power supply through a port.

Unplug it on both sides and plug it back in. The adapter can automatically interrupt the power supply if there is a disturbance in the electrical network. To reset the triggered protection, unplug it from the socket for one minute. Once turned back on, the computer should begin charging normally.

Reset NVRAM/PRAM

When the adapter is working properly, power is supplied and the apple on the lid lights up, but the screen is still black, you will need to reset the NVRAM/PRAM.

1. Completely turn off the computer using the power button. Turn it on and immediately press the combination shown in the screenshot.

1. We hold down all the keys until the laptop starts up, making sound signal download again. After the startup went smoothly and we are logged in, we need to check for updates. Click on the apple logo in the menu bar located in the left corner. Select the marked item.

1. On home page press the indicated button to open App store Store.

The system will automatically check for updates. We install all available ones and, if necessary, update the OS to latest version High Sierra.

Resetting the SMC

The SMC controller is responsible for the power supply functions. These include battery management, response to closing and opening the lid, the operation of some system sensors and interaction with peripheral devices. In any case, if you feel like your Mac isn't working properly, forcefully restarting the controller may resolve the issues.

For Aimak monoblocks and all Mini versions Simply unplug the power cord for 15 seconds. You must wait at least five more seconds before turning it back on. For laptop computers, which includes all versions of Air, Pro and 12-inch Retina, we perform the following steps.

1. Turn off the device completely using the menu item shown.

1. Disconnect the power cord. Press the three keys shown in the screenshot in the left corner simultaneously with the power button and hold for ten seconds. Reconnect the power adapter and turn on the laptop.

As in the previous case, we check and install available OS updates.

Consequences of the upgrade

Apple has made it almost impossible to upgrade in recent years. In previously released MacBooks, the user could independently replace the memory sticks. The operation is, in principle, simple, but requires the correct selection of modules. If, after an upgrade, the laptop starts beeping while turning it on, this indicates problems with the new memory.

In this case, signals are given with a pause of five seconds. Depending on the model, this may be one repeating beep or a series of three consecutive beeps. The only way out of this situation is to reinstall old modules or purchase suitable ones.

Finally

If resetting the NVRAM and SMC didn't help you, then your Mac has serious problems. The best solution You will need to contact a certified service for professional diagnostics. Don't forget that your MacBook will have limited access for a year from activation. Apple warranty and some repairs can be performed free of charge.

Video instruction

In the video below you can see firsthand how the described operations are performed by a professional.

What to do if suddenly screen doesn't work MacBook laptop Air, Pro? Of course, in this case it will be impossible to continue working. First of all, we advise you to connect the laptop to the monitor and check whether the external monitor image. If it appears, then the problem lies in your laptop, or more precisely, either in the cable or in the matrix itself. If it does not show, as a rule, the problem is hidden in the hardware. Let's consider possible options more details.

1. First of all, check if problems occur when opening or closing the laptop lid. Often, when closed, the MacBook simply turns off or goes into sleep mode. When opened, the screen turns on again. As a rule, the reason lies in the mechanical power button itself, which suffers the most and becomes unusable due to dirt. In this case, it just sticks. Users can simply fill it with liquid, causing it to simply short out. The button is located in the most visible place. As a rule, in the upper right corner, on the panel where the display is, or at the end. If there is a malfunction, the power button will need to be replaced. This simple task takes very little time.
2. If the monitor shows, but there is no backlight, this basically means that the inverter or the backlight itself is damaged. These components are responsible for the display backlight. If the inverter is not badly damaged, it can be repaired, otherwise it is replaced with a new one. The backlight lamp cannot be repaired, only replacing it completely will help.
3. If the matrix is ​​black, and there is backlighting on the sides or not, then the problem lies in the hardware itself.

Take a closer look at the possible options:

When the MacBook Air, Pro laptop display does not turn on

If your MacBook laptop boots up and everything freezes.

1. This primarily happens through problems with the hard drive.
2. It is possible that an error occurred on the hard drive.

A laptop computer can also freeze after receiving mechanical damage or as a result of moisture getting inside.

The specialists of our Telemama service center are always ready to lend a helping hand. We will provide quality repairs for MacBook Air and MacBook Pro.