I am still waiting for my retina iMac 5K replacement after receiving a defected unit (Faulty screen) Seeing this amount of people suffering from defective units all-over the forum makes me wonder how common it is to have a faulty iMac? It is my first iMac ever. I've been working on computers of all kinds and shapes since I was a kid (for more than 26 years now) and I have never ever got a defective computer (Since my first Sinclair). Adding my experience to others on this forum makes me question Apple reliability? Is this common with Apple Computers? is it exclusive to this particular 5K model? Your thoughts?