I'm playing ps3 greatest hits version with software update 1.09

I went to Angarvunde for the Find the Source of Power mission. I had not been in here before, the map was undrawn. I took the Madresi's Notes journal, went inside, met her, killed the Dragur, then nothing. Madresi Dran never gives me a key and she doesn't have anything at all on her to pickpocket. I'm can't get through the door for the catacombs. I went into the ruins and lifted the first gate, can't figure out what the lever inside the main chamber does, but mostly I need that key.

I have 18 shouts out of 20, this is stopping me from getting the platinum trophy. I'm 1100 hours into the game and PISSED.

I searched and found lots of glitches in here but they all happened to everyone after this part, i can't even get far enough in to get to the other glitches I found mentioned in message boards.

Try clearing the system cache and restarting the game to a point before the quest.

If the undead in the main hall are killed and the outlying passages explored before returning to speak with Medresi Dran, the quest will not update until both gates are open even though it still says to speak with her.

Once both gates, are open the quest will advance normally upon speaking with her. Alternatively, she can also be killed and the quest will continue.

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Actually there is no feature to clear the system cache on the PS3...