Phal wont spike HELP!

[Eahonn]

I was given a noid phal in may 2009. The owner had it for a while and it had not flowered in quite some time. After almost three years I am now getting a little anxious to see it bloom. The plant it self is in good condition the roots are enormous thicker than 1/4 inch and the whole plant is 18 inches wide. It very recently put out a new root above the bottom leaf of the plant. What can I do to get it to spike. I even did a temp drop for two weeks in the fall. Its by a west window with rice paper to diffuse and I have been weekly weakly fertilizing. Any help or suggestions would be appreciated...