If you don't have some sort of a question why are you reading the book?
I am going to guess this happens on books that are assigned or required reading for studies. In that case start with your ultimate purpose for why you are taking the course. What do you want to do with the subject that you are studying... in your life/career? Then consider what you need to know to be successful in that career (one question you might pose for each of the textbooks 'what does the author think I need to know in order to be successful in my career as ...?). If seriously considered you will find yourself in discussion with the author looking for what s/he considers important, then seeking the why's, when's, how's, who, who else, where and what the author is saying about the ideas they write about.
If you did something wrong while photoreading don't worry about it (unless your mother or someone is going to tell you to clean it up 
). If you looked at the pages in photofocus, stayed in state while going through the book I'm sure you did fine even if you lost photofocus for a few seconds it will make less difference to the results than regular reading. Just form questions and see what you get. You do want to get your reading done faster afterall. Sitting on your hands worrying that you did something wrong while photoreading is a waste of time really. Put the process into action and the more you do the faster you become.
Alex
