Hi, I have a 5K Retina iMac which is about 7 months old. Just recently there have been some odd goings on with it which I hope someone can explain or help to resolve. The first issue I encountered was the mouse pointer displaying a "No Entry" sign - red circle with a diagonal line inside. The mouse pointer would move but no allow e to select anything. The keyboard worked and I eventually managed to close down the Mac. However, it would reboot to the password entry screen but every time I went to input my password I would type the first character and then the password box would quickly fill itself. I turned off the computer for a while and this resolved the problem. A couple of days later I encountered a similar issue when trying to enter the password - complete one character and the box would quickly fill itself and become unresponsive. Anyone experienced similar? It's very frustrating and the sort of thing I'd expect from my PC!