You can make a difference in the Apple Support Community!

When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

iMac 27 does not boot from USB

Hi all,

I had to change the hard disk of my iMac 27 (late 2015) because it was broken and now I cannot reinstall the macOS.

I do not have any other iMac and I tried to create the USB from a Windows computer using TransMAC app. I tried with Sierra and Capitan macOS dmg files.

When I restart the iMac holding OPTION key, I cannot see any bootable disk.

Any idea how I could create a bootable USB from Windows?

Thanks in advance for the help.

Regards,

Rafa

iMac 27″, macOS 11.5

Posted on Jan 4, 2023 4:25 AM

Reply
Question marked as Top-ranking reply

Posted on Jan 4, 2023 8:11 AM

I am going to guess that the problem is with the format of the formatting of the flash drive or that the operating system has not correctly/successfully been installed on it. I suggest that you find someone who has a Mac and use it to make a startup disk. I do not recommend flash drives as they can be unreliable, so try using an external drive that connects via a USB cable. Good luck.

Similar questions

4 replies
Question marked as Top-ranking reply

Jan 4, 2023 8:11 AM in response to rvicent

I am going to guess that the problem is with the format of the formatting of the flash drive or that the operating system has not correctly/successfully been installed on it. I suggest that you find someone who has a Mac and use it to make a startup disk. I do not recommend flash drives as they can be unreliable, so try using an external drive that connects via a USB cable. Good luck.

iMac 27 does not boot from USB

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.