Hi boo,
Did the buttons light up on the right side of the puzzle for all the other combinations you made? That way you know that they are correct and you can move on to the next one. Double check the web browser to make sure that the symbols you are entering are correct.
If you previously used the web browser and then spoken to Nigel before beginning the puzzle, you should be able to open the door.
Let us know if you still have difficulties.