Boot up mac disk utility

Power on the computer while holding down the option key. Select Installer. Select Disk Utility. Highlight the drive. Enter Volume information Name, Format, and Scheme. Select Erase. Note: This will erase all data from the drive. Select Partition. Select Utilities. Select the Erase tab. Verify that the correct hard drive is selected in the left column. Highlight the drive Select Partition. Select Install OS X from the options Select your drives as the destination and install Allow time for the drive to format. There are times when your Mac may misbehave and refuse to boot into OS X.

You may get a sad Mac face, an audible beep, or another ailment keeping your Mac from properly booting. When this happens, you can troubleshoot your Mac by using boot options to run an Apple Hardware Test, or booting with extensions disabled. Sometimes, launching your Mac this way can help save you a trip to the Apple Store. Instead, turn to this guide in which we explain all of the various boot options in OS X that may help return your Mac to normal.

Booting from a CD? Hold the keys down until the computer restarts and you hear the startup sound for the second time. Release the keys after you hear the second startup chime. The PRAM will be reset. Holding down the Option key during startup will show you a boot screen with all bootable devices listed. You can use the mouse or the keyboard to select a device to boot into. Sometimes discs can get stuck in your optical drive. Please help. I can send you the picture of what it's showing me now. 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. 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.

Repair Boot Disk in Mac OS X with Disk Utility & Recovery HD

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.

There are times when your Mac may misbehave and refuse to boot into OS X.

Hi Fennelly. I have the same issues right now. Did you manage to bring back your computer back too life? Holy Bologna!!! I was convinced my MacBook Pro was toast. The special Poeer cycle seemed Compliments on the well structured and informative guide!

Repair Your Hard Disk in Single User Mode

Started using a Macbook Pro Md for a week or so now, when it just turned off. At the istore they performed a SMC and run a diagnostic check - proclaiming all is fine. A day after it happened again. Thank you kindly. Great guide, I have no Mac experience and was able to repair my son's Mac using your guide. After hours of trying everybody else's suggestions I fixed me problems with your pointers!!! It took many layers of fixes but eventually sorted out my MacBook.

I luv u?????? You are awesome! I reset the PRAM and it booted up quickly. Worked like a charm. You are the best. Thank you. The first solution worked for me!! The fan seems to be a lot louder.. But my MacBook is up and running. Thanks so much, Jessica and to Victor Clausson for the "special power cycle" tip. Thanks Jessica! But even after all the El Cap troubleshooting, I've still been stuck! Then, a little comment from you and I was digging into RAM at the same time, but getting no love : It's the memory sticks.

Thank you, thank you, thank you! I thought you were nuts. Unplug the power and hold down the button? Reattach the power and keep holding the button down? What was that possibly going to accomplish? Have appt Apple Store in 1hr!! Been having battery problems within my Apple Care but store refused to do anything; kept doing diagnostic, all extras……????????

I didn't remove my partition with the OSX install - I just can't access it! I don't know what to do.

I have replaced the old keyboard thinking it might be problem with the new one. Hi, I'm happy all other users solved their problems with Mac.. But, My problem seems a bit complected.. But still get White Screen after chime Sound Non of the startup combinations or shutdown work Any suggestion would be great Thank you.. Three days ago, I plugged the Macbook early into the socket to charge. The next day when I turned it on - nothing happened. No chime, no screen, nothing. Took it to Mac Genius which was a waste of time, took it to an Apple approved repair shop, they said the keyboard was clearly full of water impossible , had a technician visit the house and test, doing all the magic tricks you can do to wake up a mac, nothing worked - everyone said it's the logic board.

I have had this Macbook purchased new only 2. It didn't make sense that this essential and most expensive part of the MBP would die so soon. I had suspected the battery as responsible for some time for other issues erratic track pad for example. I backed up the computer, turned it off - no problem rebooting at all.

And in fact the computer is working much faster now. I will have it totally checked out and replace the battery 38 euros. Hope this helps people with similar issues! Thanks for your sharing, I had have same issue with you. I followed your steps. And ahaa!! That is so awesome!!

Clone bootable Apple Mac Hard Drive from Disk Utility Mac OS Sierra 2017

Its always Battery Issues with Apple Products. I gave up!! Constantly going to Apple Store is annoying especially talking to Genius staff is useless. Thanks so much! I'm grateful for your help!


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Thanks a lot!!! Suddenly Macbook Pro bought in would only turn on , and run for about 2 minutes, then shiut down. Just running that Test did something that all the other processes could not. I wish you very well and great success. I've got a 27" iMac from A little while ago it wouldn't boot anymore. I heard the "Wall-E" sound, it showed a grey background, the apple logo and a bar loading. So I was stuck. He provided me with a stick with the OS. I started the computer with the USB drive plugged in, and held down the option button. This shows the option to boot from the USB drive.

When I selected that, I got back to a grey background with an apple logo and a bar loading. It got hanging again. I did the extended test. It found nothing. Out of desperation I tried starting my computer once more with the USB. Now I did get into Disk Utility. I was able to clear the HD and install the new OS. Now I'm wondering if I could have just started the computer after the test, without re-installing the OS. Oh well, it's an old computer, I only use it for Netflix nowadays. Thanks for the tips, they were golden!

Had to log in and post that the 10 second with unplugged, then while holding do another 10 seconds, fixed my issue. My Mac hadn't been turned on in probably at least a year and this got it to boot! Thank you! No chime. I've tried a variety of fixes suggested here and in other places with no luck.

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Machine starts to boot and goes to a black screen with cursor showing after the progress bar is about halfway. I've tried various key combinations and can't get the chime so most key combinations don't work. Help button says hard disk needs replacing? I had the same problem, running extensive memory tests on my computer solved it for me, as you can see in my comment. I switch off my macbook pro before going on holiday for a couple of days.