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
Jonathan Ive as Apple's Product Visonary –
With Steve Jobs leaving Apple due to most likely medical reasons Apple’s Product Visionary position has been left empty. Jonathan Ive has been chosen for this position because of his creativity. He has a big part in what created the most major products in Apple such as the iPad and the iPhone even the iMac. I feel that Apple made the right decision with this move considering how involved Ive has been with the creation of Apple Products. If you have seen the Apple Keynotes you can see Jonathan Ive in action showing off the shiny devices. Apple looks like they are doing just fine without Steve Jobs. Don’t believe every rumor you hear even if they are about the iPhone 5.