03-19-2021, 06:40 PM
(03-18-2021, 06:14 AM)modernmagic Wrote: Yes, I am familiar with option-booting the Mac. I have tried multiple times holding the option key on restart, but the iMac still immediately shows the Apple logo and starts loading MacOS. I also performed both a SMC and PRAM reset.
Here is the flash drive I am using in case you know it does not work: https://smile.amazon.com/gp/product/B078...UTF8&psc=1
I also attached a screenshot of the flash drive to show how the mac sees it.
I also tried VHD and Legacy.
This is very strange, if you hold down the Option key, the Mac computer will not directly start the Mac operating system but will enter the OS selection menu. Is the keyboard you are using a wireless keyboard?