Your unit will not function without the white wire. It is the neutral wire from the breaker panel. If it was connected to the yellow wire on your old unit then it should go to the same yellow wire on the new unit.
Now that you have thrown in a blue wire I am confused as to how this is set up. Is there any chance you could take pictures, and then use the directions below to upload them to the JA servers? It would help a lot if I could see what you see.
Ok here is how you upload them-
At the top of your reply box is a icon that looks like a tree. It is two to the right of the smiley.
Click on the icon. It will bring up a box.
Click on browse. Another box will appear.
Click on browse again in that box.
Navigate to the place in your computer where the picture is. Select it, and then in the second box click on upload.
The second box will disapear.
In the first box click on insert.
This will upload your picture, and you should see it displayed in your reply box.
Repeat the process to upload another picture.