Error code 0xc0000225
My 2012 iMac developed error code 0xc0000225. Just shows Blue Windows screen indicating Windows boot Disk not available Have made a OSX bootable disk (Mojave) but it doesn't see it. Tried all usual tricks, but it appears that the computer can't get to the OSX software. Any assistance appreciated
iMac 27″, macOS 11.4