Mac os x computer will not boot up

Plug it back in, wait five more seconds, and then press the Power button to turn the Mac back on. To access recovery mode, boot your Mac up. You should try to press these immediately after you hear the chime sound.

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Your Mac should boot to recovery mode. You can also restore from a Time Machine backup. Image Credit: The Best Tech Newsletter Anywhere. Join , subscribers and get a daily digest of news, comics, trivia, reviews, and more. Windows Mac iPhone Android.

Ensure It Has Power

It's the same keys to reset the PRAM. Keep holding the keys down until you hear the Mac restart again. Shut the Mac down. Unplug all cables. Wait for a few minutes. Plug the cables back in and start up the Mac. Boot Mac in Safe Mode Safe Mode is a stripped down version of the Mac operating system that can be useful if you are trying to troubleshoot issues with your Mac.

Start your Mac, press and hold the "Shift" key, and make sure your Mac has at least 9 GB of free space.

Start up in safe mode

When the login window appears to release the shift key and log in. You may be required to log in twice if you have FileVault turned on. Then restart the device. Wait patiently till Mac computer finish the reboot process. Run Disk Utility in Recovery Mode If your Mac is booting but the operating system isn't loading up, you may have a corrupted drive.

Make sure the Mac is off. If it's stuck on a grey, blue or white screen, just hold down Mac's power button for several seconds until it shuts off. Hold down the "Command" and "R" keys, and power the Mac back up again. Once your Mac starts in Recovery Mode you can have access to "Utilities". You can also boot into Recovery mode Solution 4 , and then click to install the latest OS and follow the onscreen prompts.

Our article on resetting a Mac to factory settings has more information on reinstalling macOS. Free tech support. But my Macintosh HD partition the whole drive cannot be repaired, evidently. I am not sure what the problem could be. My mid MacBook pro will start and boot up but only after about minutes of holding and releasing the power button. It works fine after it finally starts. It gets power just fine and I can see the power light come on everytime I hold and release the power button. I have no idea what to do. Please help! My MacBook Pro was brought to life again.

After it tried rebooting after an update, it wouldn't turn on again. Just a very short "bssshhhhrrrttttffffrrrpppp" the sound it makes at boot up, like it's about to throw up and the front indicator went out again. My Mac Pro worked until I updated the os to high Sierra.

The Mac kept displaying something to do wth ICloud. When it is switched on the screen awakens, the Apple logo appears, the progress bar starts, very very very slowly proceeds but that is as far as we get. No further. You might consider reinstalling the operating system. That should provide a boot up menu either from your computer HD or another HD that you use as a backup. Options should include restoring a prior backup or reinstalling the operating system. Some of these options may delete personal files so use at your own risk. Thank you so much for your website!

Awesome stuff! Your instructions were really instructive and clear. Just by following your steps, I managed to get my crashed macbook back to health very fast well, 3 hours, but that is faster than sending it to the Apple workshop. Thank you so much! I turn off myMacBook Pro and when I turn back on, I get the apple with black line inching its way to the end.

If your Mac won't turn on

Gets to the end and does nothing. I ran the hardware diagnostics and it said No Problem found. Me too. Disk First Aid showed my hard drive as being completely full. I'm going to try and delete some files and see what happens. Reset the SMC and the PRAM as you suggested above on my daughters 'dead for a year' macbook pro and it is currently running and happily backing up its files.

We shall see how stable it is before jumping for joy! Using a MacBook I know only 2 yrs old! Last week it shut off while I was using it. Thought a power glitch, restarted but it was stuck in a loop. Moments after showing the Apple ID screen, it shut off, sounded the chime and over and over it went. Tried all the suggestions you recommended. Files all said ok, only problem it said was an issue with the camera.

Yea it booted up and I saved data to a jump drive. Worked fine for several days then it shut off again. Now none of the above have an effect - just chime and loop. Took it to India this summer had a few power glitches there, destroyed a kindle fire and curling iron, scared something happened to my Mac.

It has had a few problems since I got back, had to reinstall Office. Any help, please.? Thank you so much for this article. I have never heard of you or this website, but a quick Google search on my phone led me here. I had physically shut my laptop while installing the new update. This saved me valuable hours and a trip to the apple store. I am typing this review on my laptop now because of you. Again, thank you a bunch. Great article. Thanks to this article I was able to open recovery partition.

My main drive macintosh was grey and I could not run first aid on it. It also wasn't listed as a location to reinstall OS. I am backing up right now just in case this happens again! Macbook pro 15" retina, purchased in fall of for anyone interested. Hi thank you for an excellent article. Nice to see a Vancouver ite so active. My problem is with a Mac desk top but the suggestions you make apply to the top as well. I found the s that came with the computer. I put in the Hardware disk and sure enough, miraculously, after pressing ''D key up came the Hardware Test screen. I pushed the Test box button and left the computer to do its test.

After 4 hours the progress bar was within a centimeter of the end. But there it stayed even afetr leaving it overnight.

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What to do now? Any ideas would be most appreciated. Retired Apple Certified Tech. A friend's 15" MBP non-removeable battery would only flash led for a second and run fans for a second. Thanks much. You made me look smrt. Hi, thank you for posting this. Older MBP. I was getting anxious as I tried everything until I got towards the bottom of the list. The recovery partition worked!

I used a recent time machine backup.

[5 Fixes] Mac Won't Boot or Start up After macOS Sierra Update () - EaseUS

I fixed myself although only with the guidance of your article. Thank you for sharing this.

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Not sure which one worked but my mac is back- thanks for a great article - best I read on the web. I thought I tried everything to get mine to turn on and found this article and did the holding down the power button 10 seconds twice and then the third time plugged the power cord in and pressed the power button and it finally booted up! Thank you for the trick!!

Unplug the battery. Unplug the MagSafe power cable. Hold down the power button for about 10 seconds and continue to do that. While still holding the power button down, insert the MagSafe power cable and hold it for another 10 sec. And it started right up. I thought that was a crazy thing to do and how did anyone ever discover that it worked??? But it sur did the job on this laptop I managed to switched it on, where my user login logo appeared, but then a loading bar would appear and just freeze. Then I found your link, which made my day! Happy Mac again. Thank you!! Thank you for posting this: I chose a time machine backup, which is now underway I updated it to macOS Sierra yesterday night and left it be, when I opened it the next day it wouldn't continue starting up.

Please help. I can send you the picture of what it's showing me now.

2. Reset the SMC

Been trying several tips but nothing is working. Remember the reason you wrote this article, and why I wasted my time reading it, was because my computer wasn't starting up. At all! I reinstalled the OS as a clean install over the top of an install from Time machine. Problem is it won't wake properly from sleep. Sometimes I get the log in screen - where password is required - and having input the password the same screen the appears again, When I input password for the second time it then lets me in and generally gives me the pages left open when put into sleep mode. It's so frustrating and bizzare behaviour.

Disk utility tells me there is nothing wrong Any thoughts welcome. I did the power cycle tip too and it worked.

How to Fix a Mac Laptop Stuck on a Boot Screen

Mine is a vintage one already. I used to leave it on Sleep mode most of the time while connected on the charger. I'm not sure if that was the reason why the second I open it, it won't boot successfully. I'm worried about the files I just transferred from my phone but thankfully it opened so I'll go ahead and retrieve them back for safety. Thanks again! I followed the power cycle reboot steps and got my mac to give me signs of life and then when it died in the middle of boot I restarted the process and plugged the battery in the middle because I only have a 60w power supply and needed an 85w.

I used the battery as a wattage boost in the middle and got my computer back up and running. Thanks for the guidance. My Mac Pro late , non removable battery behaves strangely. It does not switch on at all. Battery shows fully charged when I check by small side switch. Now, If I remove adapter connector, Mac starts up. But no chime. Before it completes booting it shuts down. Restarts on its own after sometime. On restarting same thing is repeated. Any suggestions please Black screen, L-type chord shows a charge going on orange light , fan whirring.

Mac Won't Boot or Start After macOS Sierra Update

No other signs of life. No start up chime, no matter how many times I hard power down and restart. It's a MacBook pro with a non removable battery. Hi Fennelly. I have the same issues right now. Did you manage to bring back your computer back too life?