Thought this would be an easy thing to do but I'm stuck!

I've worked out that to remove the drive I need to remove the drive cage since the two screws attached to the right of the drive can't be accessed from inside the tower.

The cage seems to be attached to the front of the tower with two screws. I've removed these, but the cage still won't budge. What else do I need to do?

Any suggestions would be much appreciated.