im doing the Elder Knowledge quest and the door im suppoused to go through in Blackreach isnt working, the way looks clear, but the void say open door, i hit the button but nothing happans.

Which door are you trying to open? One of the doors to Blackreach or the door to the tower where the scroll is? If the tower door will not open, leave Blackreach by any exit, and then come back and try again. if you cannot get into Blackreach you need the attunement sphere