I'm trying to get the last cube in nchardak. How do I get the 3 bridges down? I can't seem to activate the control switches on the platform over the entrance, nor can I see any other way of lowering the bridges. Help please!

Keep playing with the cubes, and the wizard will let you know when you get it right.

Playing with which cubes? If you mean the control switches which the cubes go into, I already said they're not doing anything, I have 2 cubes in my inventory though.

If you put a cube into one of the pedestals, it should raise or lower a brige. Put the other into another pedestal, and see what happens. Try each one for the combination that works. That is how I lowered the 3 bridges.

I just watched a video walkthrough and he just places the cubes in the switches however when I activate the switches nothing happens. and all of my autosaves are now just entering and leving this section of the dwemer ruin :/

Do you have any other save you can go to?

Yeah but it's atleast 3 hours of gameplay gone :/

If you watched the video, then maye you can make it work. If not, then you will have to re-load. I am sorry.