You should be able to move them then (worked on Xbox 360 version). You should hear the sound of a mechanism being unlocked, and then pull the lever in the previous room to retract the metal grates. Note that if you can not rotate the pillars even though it says activate pillar you need to leave Folgunthur and then return to the dugeon. Facing the tiles, the sequence should be the eagle, whale, and snake symbols all facing outward (to mirror the similar pattern on the other side). Open the lever on the left throne to enter this room and move some tiles. You will come into a room in which stairs lead down, but a sturdy metal grate blocks your passage.

Set the Ivory Dragon Claw in the slot just above Daynas’ body to lower the bridge and continue in. Take the Ivory Dragon Claw from his robes and leaf through the notes to learn that you’ll need to uncover the Gauldur Amulet Fragment here in Folgunthur and in two other locations. Daynas Valen can be found at the very edge of the second floor ledge, but isn’t in any condition to give you useful information. You can pull the lever or just jump over to the stairs. There’s a floor trap at the bottom of the staircase.

Skyrim ledge grab mod