It is probably running an internal head cleaning routine.
FredCM wrote:
Our Canon Pro frustrates me in that it seems like it takes forever to make up it's mind about the simplest stuff. Turn it on and it's a minute or two before it will print, what in the world is it doing, and how can it possibly take so darn long? That and it uses up ink. But the printed images are perfect, there is that, that's why we have it.