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
Apple Expected To Release New Mac Mini At October 23rd Keynote
For the last few days we have heard more and more rumors backing up the October 23rd keynote in which we are expecting Apple to release the iPad Mini but today we have also heard that Apple is also set to release a refreshed Mac Mini.
The new Mac Mini’s are expected in two standard configurations both with different storage and processors. These are expected to ship straight after Tuesdays keynote.
The last redesign of the Mac Mini was released back in 2010.