HELP!!! (please look)

[Seven Signz]

I soft modded my xbox some time ago and have had no problems modding since I began. Then, one day, out of the blue, I fail to load every single map on my harddrive (even the unmodded ones). I stopped playing around with it for maybe a month or so, and then I turned it on and they all worked again. It worked for about a week or so, and then I go to play the other day, and the same thing happened, I couldn't load any of the maps. I figured it was just a fluke, so I installed the Allied Map Pack last night, but none of the maps will load. I didn't delete or move any files that weren't needed. They are all patched and signed properly. What happened???

Sorry for the Wall O' Text.