TIF not displaying, Coordinate System?

[SamPeck]

Hi there, 

I am having some difficulty with a final project for my GIS class, using Arcmap. 

I made a number of buffer layers, converted them to raster using a model, and then used the weighted sum function to create a TIF file. (Here's my model)

The only issue is, when I add the TIF file to my map, it does not display. When I 'zoom to layer' on the TIF file, it zooms out to a large area, barely encompassing my study area at the bottom and displays nothing.

 

All the input shapefiles are showing correctly on my map, so I'm really confused why the TIF composite isn't. Any help would be really appreciated. 

[DanPatterson]

Did all the input shapefiles have the same coordinate system?

For a weighted sum, the inputs should have the same extent... is this the case?

Did you set the extent of the analysis to that of the inputs? or the last input?