Nvidia takes down 364.47 drivers due to issues!
This is an issue I am still investigating but there have been reports of the latest drivers causing issues from black screens to boot issues in forums.
If you installed the drivers it may want to roll back to the 320.xx drivers. I will keep you guys updated if anything new comes out.
[Update 3/08/16 8:50pm] Nvidia released new beta drivers 364.51 which likely is their answer to the buggy 364.47 from yesterday.