I can't see my SRF in shaded mood

Hard to say for sure without the actual model, but probably has a bad trim which is preventing Rhino from meshing the surface - necessary for a shaded display. One way to check would be to use Untrim with the options All and KeepTrimObjects. That will get you the untrimmed surface, it will likely shade immediately.

Then you will have all the curves which trimmed the surface, you can either try to re-trim the original surface with those, or as it appears to be planar, try making a new planar surface from the curves. If the newly made surface also refuses to shade, then there is something wrong with one or more of your trim curves. In that case, try exploding all the curves and rejoining and see if that helps make a surface that shades…

HTH, --Mitch