So I've had my Late 2013 27" iMac for almost a month now and it's been great, until this morning when I tried to turn it on... It wouldn't boot. Tried pressing the on button and holding it in, no noise, no activity on the screen at all.. It seems completely dead. I thought it might be a power issue so I've bypassed my power board and tried different power sockets and even tested the sockets with other devices. I fear that I am going to have to go into my local Apple store, which I really didn't want/expect to do with such a new machine. Is there anything else I can try before taking the journey in store with my mac?