I also got stuck here. Put the 2 boxes on either side in the middle of the energy bridge. Then use the third box to activate the switch, when the bridge dissapears the boxes will push against each other, so you can jump on them.
mmm I was thinking about that, but since u need a box to be on the purple switch, you only have 2 boxes left and I can't get anything with just those, I'll keep trying tho tyty