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I updated my MacBook air successfully. But, when time came for installing the OS it stops installing at the end of competition after so much time I switched of computer off and when I restart it freezes with white blank screen with apple logo loading. Please help

Hello Naveen, for let us to help you, you should provide us some more information. 1): Which Mac Os X release are you trying to install? 2) Have you downloaded from the App Store? 3) Are you trying to attempt a clean install (have you formatted your drive) or an update? 4) If you are doing a fresh install I guess you are using a usb key to do it, have you use some utility like DISK MAKER X? Or What? Few weeks ago apple have messed up the OS X installation files so myself also have to download again Yosemite and El Capitan, maybe your installation file could be the mentioned wrong one, try to download it now again. If the Os X Installation file is ok, the other problem could be the HARD DRIVE… Do you have a the 4200 rpm data drive or ssd one? Especially if you have the old data drive it could be damaged and could be time to replace it.. Let US know..