User blog comment:Kaloneous/Mass Effect 3 Ending DLC Denied and PAX/@comment-2250460-20120317205714/@comment-4118072-20120317211907

This is actualy a bug (glitch). Here's how to solve it from the TES wiki: The riddle to open the gate by turning pillars may encounter errors. The turnable pilars may not turn on activation (by pressing the A button when looking at the pilar). To resolve this exit the cave from where you came in and re-enter. This is a bug. Saving and reloading may also fix this.