Haven't heard of that problem before, I know that input usually makes the screen go black completely, but not blue.
The only other thing I can think of is that you haven't used set sprite to turn off the backsave of the sprite, therefore you would get the blue screen problem.
For more ways to get rid of the blue screen when using sprites check this link out
http://developer.thegamecreators.com/?f=dbpro_tutorials and look for Sprites and the Blue Background.
If this is not your problem could you post some actual code please.