The only thing your constant bumps accomplish is increasing your posting counter and making people ever less interested in helping you.
We still don't know what your problem is.
the cells is loaded fine and in normal times but stays black nothing gets loaded
This tells us nothing, you're contradicting yourself. Either it loads fine, or nothing gets loaded and it stays black, but not both.
If the game hangs in the loading screen the NIF is broken
If the loading screen is empty but the cell is loaded fine, the game can't find the NIF.
If the cell loads but stays black with blurry bright spots (as if you're half blind) it has nothing to do with the loading screen. This happens when you teleport to a place outside the region border or when something else disrupts the loading sequence.