Hmmmmm this sound like a tricky one, if it is not bleeding then there must be something jammed in the pipes or the lever is broke. I have changed pads on mine before but when i did i never disconnected any pipes, one thing that was very clear why my brake would not work was the fact the the pads were so rusted and impossible to move. What i would do is try to unblock the pipe and look at the condition of your caliper, and lastly when filling with new fluid be sure not to allow any air into the system, this can be avoided by having the nib of the oil conatined fully emersed in your oil resevoir.
Let me know how you get on
Elliot