I've lit all the 4 outer tower lights but I can't get the central elevator to go the top floor--the fifth top button light will not light up?

I feel strange about starting on a third,.. even if they weren't connected.. Or are they? Also I would like the whole serie and purchasing the whole collection in one place, not spread around..

My PC and GPU are more than enough for this game but within the first minute as soon as I go near the old lady, everything grinds to a slow painful nightmare. Even trying to move mouse to exit takes minutes of overshoot. game is fast initially

I have powered the four generators and opened the door to the area where the four generators are in a single column. The GREEN and the BLUE I can make to correspond their counterparts, but the RED and the BROWN give me a headache. I assume their starting points are different, but I rerally just want a big help and hint here so I can move on....

it always 720!