How to solve the lexicon puzzle in the Skyrim Quest 'Discerning the Transmundane'?

I put the cube in the spot where it goes but nothing happened, my quest didn't change or update.

I have not found the elder school yet, but have used the sphere and now am putting the cube in its spot but nothing happens. Only 2 of the 5 buttons light up to activate, what haven't I done our am not doing right?

How do I solve the lexicon puzzle in the Skyrim Quest 'Discerning the Transmundane'?

You have to press buttons in a certain order in order to complete the puzzle. There are answers to this question all over the web.

GameFAQs

Youtube

Elderscrolls Wiki - This one is particularly useful as it lists possible bugs with the quest at the bottom.