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Appleによって製造されたiMac Intel 24インチの修理ガイドです。

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Stuck on startup boot cycle

My iMac is stuck on a the start up loadscreen.

I turn on the Mac, hear the Mac startup chime. The usual white screen with the grey apple logo appears with a black loading bar underneath. The loading bar gets 3/4 of the way full and stops.

I have no idea what to do…

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What is your exact model? Plug in your systems S/N which you'll find on the bottom of your stand foot here EveryMAc - Lookup Once you know tell us!

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Model: a1418

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@tylerneely - OK, which A1418?? You'll need to give us the exact one.

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model: a1418 (emc 2554)

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OK if you do have one of these: 21’5” iMac (Late 2012) Then its not looking good ;-{

This model comes with either a discreet SATA HDD or a PCIe/AHCI blade SSD. You could also have gotten a Fusion Drive config which have both of these discreet drives setup as a logical drive (the SSD is a cache drive)

I’m suspecting your drive (or drives) have an OS corruption or the drive has failed.

Lets restart the system pressing on the D key to enter into diagnostics lets see what it tells us. If you upgraded to High Sierra or newer Apple messed up diagnostics so if it doesn’t work we’ll need to try another direction.

Reference: Mac startup key combinations

If Diags fails, Do you have access to a second Mac which is running the same version of macOS your system is using or newer? If you can setup a USB Thumb drive following this guide: How to create a bootable macOS Sierra installer drive. Then using that drive reboot your system and this time press the Option key to enter into Startup Manager to select the Thumb drive to boot up from. Can you get that far?? If you can then run Disk Utility from the menu and First Aid. Let us know what you find.

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Hold Command+ R on startup this brings you to recovery mode.

Click the top right apple logo go to startup disk see if you can see your hard drive if its not there your hard drive has failed but you may be able to repair it in disk utilities.

Go to Disk Utilities Click your hard drive then try to first aid the hard drive.

If it doesn’t work for you might need to reinstall the OS it will not remove files if you do it properly reply to my answer and I can help you thru the steps you will need another computer

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It won't go beyond the white screen so I can't access disk utility.

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Really need to know what you have for a system.

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If you have bootable flash drive you can see if it is an os hard drive issue

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Tyler Neely さん、ありがとうございました!
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