Why is the Bitlocker PIN screen sometime blue and sometimes black?

I am using Bitlocker on a Windows 8.0 laptop. I have noticed that sometimes when I boot up, the Bitlocker PIN screen has a blue background with white text and a white, full rectangle box to type the PIN in. Yet other times the Bitlocker PIN screen is black
with white text and the "box" to type the PIN in is just a blank space framed by braces.
This is not necessarily a problem since in either case I can put in my PIN and everything works correctly, I just want to know why are there two fundamentally different Bitlocker PIN screens and what causes one to appear instead of the other?

By the way, when I booted up today, I got the normal Blue BitLocker screen. I have noticed that if I restart the computer from Windows I always get the black screen, but on a fresh/cold boot it seems random which one I get.
Ok, I see the screen now, it mostly seems a fast boot causes this issue. Since the screen image depends on the behavior you shutdown the PC: "Restart" or fresh/cold boot. As a test, I suggest you disable the fast boot feature in Windows8 and
check if it is the culprit.
Type "powser button" in the search charm bar, then click "Change what the power buttons do", Untick the "Turn on fast startup (enabled)"
Check whether the screen remains black screen. 
Yolanda Zhu
TechNet Community Support

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