When I go to the /wp-login.php portion of my Wordpress site I get a blank white screen. In fact, throughout the entire domain I get blank white screen. Also, I can't even connect to the server via FTP (tried with other FTP accts to make sure not FTP client). Is this an issue with the host or my WP? Not even sure how to fix it if it's on my end cuz I can't even login to FTP or to the Admin Dashboard! Any help = appreciated.
I have this exact same problem when people upgrade their WP install, but do not turn off plugins. The fix is usually simple. FTP/SSH in, rename old plugins folder, create a new empty one and reload WP page.
However, since you are saying that you can't even FTP into your server, this sounds like an outage on your providers side. Perhaps it also affected their database server.
Call them up and see if it is something on their end.
Contact your hosting support.
That's what they're for.
The WP issue could be many different things, they will have access to logs and be able to (hopefully) tell you pretty quickly.
The FTP problem is also something your host will need to help you with.