Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Retina 5K iMac Announced At Apple October Keynote
Apple have announced their latest model of iMac and its coming in the form of the 5K iMac and you can find all the juicy details below.
It was by far one of the biggest announcements of the iPad 2014 keynote and the Retina display 5k iMac that has been announced may make your eyes pop out.
The new 5K iMac features a 27-inch retina display that goes out to 5,120×2,880 pixels which is seven times greater than Full HD video and larger still than 4K, Apple claimed.
The 5k iMac is just 5mm thick, 8GB of RAM and a 3.5GHz quad-core Intel Core i5, with upgrades available up to 4GHz with an Intel Core i7.
Graphics are powered by the latest AMD Radeon chip, which Apple claims offers 45 percent faster performance versus its predecessor
It goes on sale today with UK prices to be confirmed with US prices for the 5k iMac retina display starting at $2499, so its once again time to go rob a bank!