Problem with admin after moving to new VPS

Hello there.

I moved all my content from one VPS to another few days ago, and now my wordpress is working fine (with all the plugins and stuff) but i cant login to admin panel ( i got just white space).
All paths, database data, username and password, url etc is the same, so i guess that i don’t have to change anything in configuration file. Actually i’m almost sure that i don’t have to change it as my WP is working just fine, and all it’s modules is working great, i just can’t login to admin panel. (for example wpematico works great, and wp2smf plugin)

I tried to change chmod of wp-admin directory and all it’s files to 755 but it didn’t helped too.

Any suggestion on how to fix this please?