I've just created a new omposition and added my first layer which is a solid colored white. But I can't see it, can someone please suggest what is going on?
Select the solid in the Project Panel and check the size in the Info displayed to the right of the thumbnail. If the size is the same as the comp try dragging the solid from the Project Panel to the layer and see if it shows up. If it does not, let us know. It means something strange is going on with your system that is not normal and it could be a GPU driver. You should also try importing a png file or some video footage.