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
OS X 10.10 Yosemite Is Released This Week For Mac
Apple has announced that it is releasing OS X 10.10 Yosemite for Mac this week after their Apple iPad event that was held today at its headquarters in California.
Yosemite is free and is pretty easy to install. However, before you perform any big update to OS X, you should complete a few tasks to ensure that your Mac is ready to go.
Before installing a new operating system it’s worth doing a bit of housework. Here are ten things you really ought to do before OS X 10.10 launches
1. Find out if your Mac will be able to run OS X 10.10 Yosemite
2. Make sure you have sufficient RAM to run OS X 10.10
3. Make sure you have enough space for OS X 10.10 Yosemite
4. Get access to the Mac App Store
5. Update your software for OS X 10.10 Yosemite
6. Update your third party apps
7. Ditch really old software
8. Make sure your Mac is healthy
9. Back up your Mac
10. Set up iCloud
With the Mac App Store built into OS X, getting the apps you want has never been easier. No more boxes, no more discs, no more time-consuming installation. Click once to download and install any app on your Mac.
Since developers are constantly improving their apps, the Mac App Store keeps track of your apps and tells you when an update is available — including OS X software updates.
Update, 21:43 BST : Update has been authorized CLICK HERE TO DOWNLOAD