Jupyter Notebook unable to give output

I have been using jupyter notebook form anaconda navigator since long time,but last week I encountered a problem with my saved projects in jupyter notebook.So as I started running my codes,kernels are still running but not showing any output.Like before this the code used to run and give output withinh seconds but due to this issue the kernel keeps loading.I also tried reinstalling my Anaconda navigator to check if thats an issue but this problem was the same after reinstalling it.
So How/What should I do to solve this problem ??