Magento 2 admin page load but login window is not show

[rodolfobertoli]

Hello, 

I have a magento 2.1 CE site working for several months, Until last night I was working ok in the admin backend and front end. Today when tried to enter the login page at backend it is just the black background and the login window is not displayed, I have no idea what could lead to this. 

Tried several browsers and re-deployed the static content again using the console command which was done ok, but problem remains: Frontend works ok and backend just show a black background and no login window.

Any advise would be appreciated!

[rodolfobertoli · Accepted solution]

ummm, solved the problem already ( never knew what happened ), just ran the upgrade, compile and re-deploy the static content.

php-cli bin/magento setup:upgrade

php-cli bin/magento setup:di:compile

php-cli bin/magento setup:static-content:deploy

then admin login window was show again.