White screen and progress bar on login screen

Hi
I recently upgraded my Mac Air 2012 to Yosemite. That went fine with no issues. I then turned on FileVault and left the computer to encrypt and optimize the system drive overnight. I woke up this morning to find that the computer had crashed and automatically restarted sometime during the night. The FileVault screen in System Preferences says that FileVault is on for System. I am hoping that this means the the encryption and optimization process completed before the crash.
I only ask as now, whenever I login to my Apple Air, the login screen is blank white. When I enter my password a progress bar appears beneath the password box. When this progress bar has reached its conclusion, the computer logins in to my account and I can use it without issue.
I know that this white screen should not be there as I recently upgraded my Macbook Pro to Yosemite and activated FileVault. I can now login to that computer on a screen with a blurred image of my desktop behind it. Once the password has been entered, there is no progress bar, I am just immediately logged onto the desktop.
Any idea what might of happened and how this can be solved?
Ta.

Having spoken to Jigsaw 24 Tech support have solved the problem - just needed the PRAM resetting.

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White screen and progress bar on login screen

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