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Mac PC stuck on white screen and not doing anything.Afterpowering on while pressing command and R key , screen &nbsp;changed to black and &nbsp;now it &nbsp;is on black all the time.<br />
Can anyone assist me to boot the Mac PC to normal working screen
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Mac PC stuck on white screen and not doing anything.Afterpowering on while pressing command and R key , screen  changed to black and  now it  is on black all the time.
Can anyone assist me to boot the Mac PC to normal working screen

Mac PC  not booting

All of Apple's hardware is produced solely by Apple Inc., who determines internal systems, designs, and prices. Apple buys certain components wholesale from third-party manufacturers. The current Mac product family uses Intel x86-64 processors. All Mac models ship with at least 1 GB RAM as standard. Current Mac computers use ATI Radeon or nVidia GeForce graphics cards and include a dual-function DVD and CD burner, called the SuperDrive. Current Apple hardware includes the iPad, iPhone, iMac, Mac Pro, Macbook, iPod and Apple TV. Discontinued hardware includes the Apple I, Apple II, and the Apple III, the Lisa, the Newton, the Quadra, Performa, Centris, Macintosh II and LC series, the Power Macintosh, iBooks and the MacBook.

Apple Hardware

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.