Why is this object completely black while in edit mode? My object in Edit mode has gone completely black in edit mode, and I cannot seem to correct it.  I was following a tutorial at the Lyndia site working through a UV example, and I never went much further than unwrapping the object, and it did not appear to be the same object the tutorial was illustrating and eventually got to this state trying to remove extra vertices that were showing up.  I also tried to remove the seams, but cannot even add them nom

I am going to start the project again, but I would like to know what happened, so I do not do it a gain unless I need to.  Any help would be appreciated.


Thanks
In this case mesh is built with too many vertices and faces serving no purpose for this not complex mesh. Initially it has slightly more than ~2000 polygons which is too much for that.




Select all with A, press W > Remove doubles. It will tell you that around 2000 double vertices was removed.
Select all if not selected and press Ctrl+N to recalculate normals. The model will look as usual from now on.




Read about normals: Why are some of faces in my mesh darker