Free for ios instal Big Sur2/29/2024 ![]() If the boot fails, you may get an Apple error of some kind, which USUALLY means that there is something wrong with the internet connection. Do not release the keys until you see the spinning globe. Press and release the power button, then immediately press and hold Opt+Cmd+R. If you only see a blank screen, and it has been longer than 5 minutes, press and hold the power button to shut your iMac OFF, then try again. Don't use any other keys, only Option+Command+R ![]() The default Apple icon might appear for a few seconds, but internet recovery boot should always show the spinning globe at some point - might take a minute to see that, but you should see it. I have seen a few that eventually boot after nearly 20 minutes. That boot to internet recovery can be very slow. Best choice will be wired ethernet (test without using wifi) If you try to boot to internet recovery, try the default choice for that, which is Option+Command+R And, I have found that it is very common for that to fail with an error (I think that Apple does not support Diagnostics for Macs that are considered obsolete, typically those more than 6 or 7 years old - so yours is considerably older than that. ![]() Your boot with Option+D should be booting to hardware diagnostics, and should not work unless you have an internet connection. I still think you will have an easier time of this with a bootable USB Mac system installer. That bootable system needs to be correctly installed (or external drive actually plugged in to your USB port.) Your 2010 iMac should show any system from Snow Leopard (OS X 10.6.3) to High Sierra (macOS 10.13.6) Some older Macs will bring up that menu, and will NOT show any bootable device that is not compatible with your older iMac. Of course, the Option boot picker window is always the Option key (no other key pressed) (I guess that is what you mean by "Disk Choices menu" You have to use a drive that you know has a system installed that will actually boot your iMac. Usually, that is helped by doing an NVRAM reset during first boot. ![]() I often get intermittent results when using various boot key shortcuts. This is usually only cosmetic, but it may prevent you from configuring a task to use Apple's replication utility to make a legacy bootable copy of the startup disk.I have a couple of different iMacs from that time period. On Monterey and later OSes CCC v5 (using the old math) may over-assess the disk usage of an APFS source volume.
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