Apple’s Worldwide Developers Conference to kick off June 10 at 10 a.m. PDT with Keynote address

The Keynote will be available to stream on apple.com, the Apple Developer app, the Apple TV app, and the Apple YouTube channel. On-demand playback will be available after the conclusion of the stream.

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

No OS on 2008 iMac and no USB boot works

Hello, I am trying to reinstall MacOS 10.11 El Capitan on my 2008 iMac and USB Boot will not show up. I have the application on its own on a USB drive and nothing shows other than recovery when I hold options on the Mac. I have tried resetting PRAM, and I don't know if there is any other way or if I am doing it wrong. USB drive is GUID Partition Map, formatted in the MacOS Extended (Journaled) form.

Posted on Jan 28, 2023 6:56 PM

Reply
Question marked as Best reply

Posted on Jan 28, 2023 7:17 PM

Drag-copying the installer only works when there's already an OS on the computer. Click here and create an installation thumbdrive.


(233668)

Similar questions

2 replies

No OS on 2008 iMac and no USB boot works

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