It isn't displaying anything at all on the wall. No light, blue screen or anything else.
Usually when you start one of these up they will go into standby and the bulb will stay off. You then press and hold the start button (a light may be blinking in the meantime signifying stand by mode) which then starts the lamp.
"It isn't displaying anything at all on the wall. No light, blue screen or anything else."
I had this same exact problem before. It may be the wall. Try aiming the projector at a different wall and it may work.
Okay, in all seriousness, I believe there's a combination of buttons you need to press, in order to receive the projection. For my computer and projector it is Shift + the F3 key. After pressing Shift + F3, I then will see on the wall what I see on the screen. In fact, sometimes the screen itself is blank until Shift + F3 is pressed.
Good luck. I hope this helps. Let us know.