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 Release Mac OS X Mountain Lion
You can now download Mac OS X Mountain Lion from the Mac App Store HERE . The price is one of the cheapest operating systems to date priced at $19.99 / ?13.99.
Apple announced Mac OS X Mountain Lion back in February of this year and have since showed it off at every Apple event since. Earlier this month Apple seeded the Gold Master edition of Mountain Lion to developers and just last week we revealed it would be launched to the public on the 25th of July.
Download Here : http://goo.gl/p8MBw
We were lucky enough to get our hands on Mac OS X Mountain Lion Beta and have complied a list of videos and articles to help you get started with Mac OS X Mountain Lion below :
OS X Mountain Lion