Trigger the gala event glitch. i cant get past it!

[Audaxity]

ive been having a massive problem with trying to get past the quest "trigger the gala event" on dead money.

when i get to the switch at the top of th tower, i hit it, and i hear the fireworks, but i dont see it, also, the ghost people spawn and all the dialogue goes on as normal, except, the quest doesnt complete and i cant continue through the game.

ive tried using the console commands such as:

 

(x = base id quest value)

 

getquestcomplete X

resetquest X

startquest X

completeallquests X

 

and theres a few others but ive forgotten them,

i know this is also a glitch for the 360. but im playing it on PC.

 

any help would be appreciated. cheers