Hi.

I'm here, in the end of this video, where you gotta jump onto a ledge and then go into a doorway.
http://www.youtube.com/watch?v=MeXabjfQebA

In the video the beeping stops as soon as you get inside the doorway. But in MY game, the collar keeps beeping and i died.

What to do? I'm kinda stuck.

Thanks.

In the video, the speaker above said doorway is shot out before attempting to reach it, which makes that a 'safe area'. If you run for the computer you can turn off the indestructible one on the wall as well, making the whole room safe.

If the doorway speaker is not shot out, then you will be in its range and the collar will keep beeping. You don't have to jump onto that ledge, btw. If you start on that safe spot on the staircase under the red speaker, and keep moving, there is enough time to run to the computer and shut the thing off before your collar explodes providing the destructible one over the doorway has been shot out.