Mass Effect Thorian Node Glitch. Please Help!!!

I really hope this issue can be resolved, It is the reason I created an account here. I am near the end of the Feros level where you have to destroy 6 Thorian Nodes to continue, Unfortunatley when I reach the third Node the health bar does not appear which means it can not be destroyed. I have definitley destroyed the other Nodes, I have not missed any at all. I also turned the auto save feature off at the beginning of the game in fear of skipping through conversation dialogue and accidently pressing the wrong speech option, So that means I can not restart from when you first enter the Thorian lair and I can not restart the level.

Can this issue be reolved? I am level 42 and have finished 3 main quests and nearly all of the side quests, So starting over again is not an option for me. I have invested too much time into this game to just simply start over because of this ridiculous glitch/bug. Please help!