toddlers eh...
Open your machine and have a good look at the keyboard. i want you to have a look at it very closely.
On the Keyboard very near the top you should have a set of 10-12 Function keys listed as F1, F2 and so on. On one of these keys there should be a little pictogram of 2 screens with a / in the middle of them. Do you see it?
Now look for another key on the board that had the letters Fn printed on it. Press the Fn and the Function key number as referred to above together on startup. this should i hope bring back the life to your laptop screen.
if this wont work then there is a chance that your laptop's graphics adaptor might have gone or something has come misplaced in which case you will need to shell out some money and take it to a technician to repair.
either way it will work again and please try to remember that toddlers and laptops really dont mix very well. My friends toddler pulled off her space bar when i was round hers then presented me with it. luckily i know how to refit these things.