My iMac won’t boot
Hi
i am getting the question mark box when trying to boot my iMac so i power down hold command +R which presents me with a lock icon and password. I imput the password but nothing happens it just disappears and allows me type password again but does not load anything so I am unable to go into recovery.
id be greatful for any help/advice. I’ve also tried resetting pram but that doesn’t seem to be allowing me to do that as nothing happens !
iMac 27″, macOS 10.13