Mac Won’t Turn On or Start Up Properly?

A Mac that suddenly refuses to start can be worrying, particularly when important files are stored on it. But a Mac that appears completely dead and one that is turning on but failing during startup are two different problems.

The first step is to work out which one you have.

Is the Mac actually turning on?

Press the power button once and pay attention to what happens.

On a desktop Mac, listen for sounds and look for any signs that the display has come to life. With a MacBook, check whether the screen changes at all or whether there are other signs of activity.

If absolutely nothing happens, you may be dealing with a power problem.

If the Mac appears to start but the screen remains black, shows a flashing question mark, displays a progress bar that never finishes or repeatedly restarts, power is probably reaching the Mac and the problem is happening later in the startup process.

That distinction matters because the next steps are different.

If there are no signs of power

Start with the simple things.

Check that the power cable or charger is properly connected at both ends. For a desktop Mac, try a different power point if possible.

For a MacBook, connect it to power and give it a chance to charge before trying again. A battery that has been completely discharged may not respond immediately.

Disconnect external drives, hubs, printers and other accessories that are not required to start the Mac. A faulty accessory or connection can occasionally interfere with startup.

Then try the power button again.

If the Mac turns on but the screen stays black

A black screen does not necessarily mean the Mac itself has failed.

If you use an external display, check its power and connection and make sure the correct input is selected. Disconnect docks and adapters where practical and simplify the setup so you are testing the Mac with as few other devices involved as possible.

For an iMac or MacBook with its built-in display, look closely for any indication that the screen has changed when you press the power button.

If the Mac seems to be running but you still cannot get an image, the problem may need more detailed diagnosis rather than repeated attempts to restart it.

If you see a flashing question mark

A folder with a flashing question mark means the Mac cannot find a usable startup disk.

Sometimes this is a software or startup disk selection problem. In other cases, it can indicate a problem with the internal storage itself.

If your files are important and you do not already have a current backup, this is a good point to be cautious.

Repeated repairs, reinstalls or disk changes are not something to rush into when the only copy of important data may still be on the Mac.

If startup stops at the Apple logo or progress bar

A Mac can start normally at first and then stop during the startup process.

Give it some time before assuming it is frozen, particularly if macOS has recently been updated.

If it remains stuck, shut it down and disconnect unnecessary external devices before trying again. External storage, docks and other accessories can sometimes complicate troubleshooting, so a simpler setup makes it easier to identify where the problem lies.

If the Mac repeatedly gets stuck at the same point, further diagnosis may be needed.

Try Safe Mode if the Mac can get that far

Safe Mode starts macOS with a more limited set of software and can help determine whether something that normally loads during startup is contributing to the problem.

The way you start in Safe Mode depends on whether your Mac uses Apple silicon or an Intel processor, so it is important to use the appropriate method for your model.

If the Mac starts successfully in Safe Mode but not normally, that is useful information. The underlying problem may involve software, login items or something else that loads during a normal startup.

Be careful before erasing or reinstalling anything

When a Mac refuses to start, reinstalling macOS can sound like an obvious solution. It should not necessarily be the first one.

If the Mac contains files that are not backed up, protecting those files should come before destructive troubleshooting.

A macOS reinstall and erasing a Mac are also very different things. Do not erase the internal drive simply because the Mac is not starting normally.

If you are unsure whether your files are safely backed up, stop before taking a step that could remove them.

Once the Mac starts again

Getting the Mac running is good news, but it is worth spending a few minutes working out why the problem happened.

Make sure you have a current backup, especially if the Mac has just experienced an unexplained startup problem.

Check your available storage too. A Mac that is extremely short on free space can develop performance and reliability problems. Our guide to freeing up disk space on your Mac explains how to see what is using the space and clean it up safely.

If the Mac was already becoming noticeably sluggish before the startup problem appeared, see why your Mac is running so slow for a broader look at the common causes.

Most importantly, do not assume that one successful restart means an unexplained problem has disappeared permanently. If startup failures return, the Mac shuts down unexpectedly or you see repeated storage or disk errors, it is worth investigating the cause.

When it is time to get help

If the Mac still shows no signs of power, repeatedly fails during startup, cannot find its startup disk or contains important files that are not safely backed up, getting help before trying more invasive fixes is usually the sensible next step.

Your Mac Tech can help diagnose startup problems, work out whether you are dealing with software, storage, power or hardware, and help you choose the safest next step without doing more than the problem actually requires.