Blank window in WP-Admin

First I’m not sure which version of WP I’m using as I can’t access anything in the admin panel.

Last month I updated my server and moved all the data from my old server via WHM control panel.

The blog and all the links seem to be working for visitors( https://www.AGreatFare.com/TravelBlog) but when I log into admin I get the menu on the left, but the window on the right is blank.

I’ve seen quite a few posts about this but most seemed to have been caused by updating a plugin or theme…

I tried disabling all my plugins and themes but it didn’t make a difference… I also read that someone else had a similar problem and “curl” wasn’t activated so I activated it through WHM but still no success….

Also, all the links in the admin seem to work, except the link to collapse the menu which is located at the bottom of the menu.

I’m also wondering if I can just upgrade and not lose my content(although I’m not sure how to upgrade it if I can’t see any links in admin)

Any ideas why my blog is working on the front end but on the admin side it isn’t?….

I’m very un-tech savvy so keep that in mind if you have any ideas of what I should try…

thanks,
David