Hot answers tagged osx
Your iMac does not meet the requirements for El Captain. Although it states that some general requirements are: OS X v10.6.8 or later 2GB of memory 8.8GB of available storage There are also hardware requirements that your iMac does not meet. It states that for an iMac it needs to be a mid 2007 model or later. I'm not sure how they determine the hardware ...
I'd go for the full Cmd ⌘ Opt ⌥ R at boot & work from Internet Recovery. Nuke & pave. Disk utility won't let you do much at all with the boot drive if you're booted from it. You also don't want to inherit any legacy from the previous owner. At the moment you don't even own the OS that's on it.
Your question can't be answered as you have written it. You're asking if something is possible. Things are only impossible until they're not. Can a person break into your room if you've locked the door? Can someone steal your car if they don't have the key? Can pigs be made to fly? The answer to all three is tehnically, yes... if someone really really ...
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