Thanks for these very crisp and clean entries. Text is very legible. The "lock" for the screen might be a bit harsh. Can you play with the monitor a little bit?
Another thought about the computer. See the other entries where the keyboard and screen are a little cleaner. Give that some thought. Likewise, let's use just two colors (green/black or blue/black). Finally, if you look at the text of some of the other entries, it is a bit more branded-looking. The text here is large and readable but not a typeface that would be associated with this book/website product. I think you are on to something (how you got to this based on my description, I have no idea, but its great)