I'm hoping someone can help. I have been given a 21.5" iMac (2011) running mavericks via work, where it was managed via either AD or Mac OS Server so that only domain accounts can login. I do not have access to any admin account and it seems all startup options are disabled as i can't get into recovery mode, target disk mode nor the disk start up option, with the later being password locked . I am not bothered about the data on the disk as i wanted to wipe it and the only option i can think of is either trying to replace the drive myself or send it off to get the drive replaced. Can anyone think of a method of accessing the system to allow remote install via thunderbolt?