WordPress Website Display Fix

Need help troubleshooting and fixing a WordPress website that is not displaying and cant access by wp-admin. Need to identify the cause (E.g. php? plugins or other issues) and implement the necessary changes to resolve the display problem. Probably a quick fix for an expert eye. Experience with WordPress and website troubleshooting is important for this short-term project. Website is host by Bluehost and domain is on Godaddy so familiarity with these platforms may also be needed.