I'm developing a Magento store and there is a guy that manages the store, we were transferring the store to another domain but the old one was with all products.
The guy went in advanced configurations and disabled all modules in the old Magento installation, even the Mage ones and now the initial page is white and the admin is too, what could I do to solve this problem?
The version of Magento is 1.9.1.1.
So, he disabled all the Mage modules, including REMOVE ENGINE ie Mage Core?
Hmm...
Ok, here's what you do.
Use phpMyAdmin to open core_config_data, sort table by path and look for all the paths beginning with advanced/modules_disable_output/Mage_ and change the value from 1 to 0
Then delete all the mage--? subfolders in var/cache/ so Magento is forced to reload the configuration data out of the core_config_data table.
This should put your engine back in so the old jalopy will run.