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
Virtualization Face-Off of Mac OS X
In the virtualization world of Mac based operating machines, two different choices are present: VMware Fusion and Parallels Desktop. Both the applications requires major improvements for operating systems based on Windows technology, but, these programs have been quite receptive to the Mac OS X Lion users as they have been upgraded to cater the needs of the latest Mac virtual machine. Apart from the hosting habit of the Lion model, both the programs take complete advantage of the changing policy of the Apple Inc. which enables the users to operate the desktop version of Mac OS X Lion onto virtual machines. Before the release of Lion, the company had the policy of providing limited usage to the Servers of Mac operating systems only. Obviously, both Fusion and Parallel have the ability to run different versions of Windows and Linux operating systems which was the primary use of the application.
Reviews on Parallels Desktop reported that not much updates have been added to it since, it’s last up gradation, a year earlier. Moreover, it also reported no significant changes in the VMware Fusion. Both Parallel Desktop 6 and VMware Fusion 3.1 operate effectively on the Mac OS X latest model. A slight up gradation of Fusion 4.01 is backed by the reason of making the user capable of regaining the ability to rum VM desktops of Mac which turns out to be quite a useful feature for those who are Mac testers and developers.
A feature of Parallel Desktops 7 which is quite disliked by its users is the difficulty they face is the installing of the application into the Mac Lion. It has a default setting of assuming that the user does not have a local copy of the version and thus, it starts re-downloading the entire image file having a size of 4GB. In case the Lion Installer image has been already downloaded, Parallels allows the user to skip through arcane hoops in order to make use of it. This case is not true with the Fusion 4.01 version. It works greatly with Installer of Mac Lion.app installer file like it easily does with the Windows or Linux .iso file. The only difference between the two is that the Fusion will not provide access to the user to the Mac App Store for the purpose of downloading a fresh copy of the Installer. Parallels Desktops are, however, inclusive of this feature and allows direct access to the Mac App Store. This difference between the two clearly indicates that Parallels assumes new users whereas, the Fusion has the ability to assume more technical users.
Similar to Parallels, Fusion too, is not able to install the Mac OS X from a partition that is present, a disk image or a Time Machine backup. Similarly, both the softwares cannot see Thunderbolt or FireWire drives which means that once the user is running the Installer or Lion on the VM, the operator can make use of migration tools which the company is providing for transfers of this nature. Since most of the Thunderbolts and FireWire is inclusive of USB ports, buses can be switched away for enabling such migrations and then return to the faster bus in order to maintain everyday operations. It means that the user is unable to create a backup for the Mac VM separately through the Time Machine if the user does not own a USB drive for the reason. From this it can be concluded that Parallel Desktops and VMware Fusion equally support the Mac in its VM aspect, in spite of the difference in the installation process.
An area where the Parallel is taking a bit of advantage over the Fusion is its $20 iOS application which enables the user to smoothly operate VMs wirelessly from iPhones and iPads along with operating the host Mac OS X Lion via a VNC connection. In the VMware Fusion, no such feature is present, but, the user can control both the Mac operating units host and its related VMs through standard VNC client apps on iOS.
On the other hand, the area, where the Fusion outclasses Parallels is the support it offers to Windows 8. Although, the developer edition can be installed in both the applications, VMs Parallel’s tools and drivers cause the screen of Win8 to black out. Tools and drivers of Fusion, on the other hand, simply work out great for Windows 8 operating units.
Concluding, Parallels Desktop and Fusion is not deemed as an important up gradation for many users, but, for those who want to operate on both Mac and Windows VMs, the investment is worth doing.