I got a 90 si a while ago and the moon roof worked perfect. I used it maybe once or twice and now it doesn't budge. Any ideas of what it could be besides a fuse and motor?

 

Seals/rails are gummed up and have caught it. Take out your linar and check it out. Removing it, greasing it, and cleaning it regularly (once every year is what I would do) just to keep them glidding. Also, seals in those tend to shrink and crack, causing leaks.