TL;DR: This is not an issue pertaining to our software. This issue comes from a limitation on your new hosting environment.
A white page is the manifestation of a PHP timeout, PHP memory outage or a PHP error. Since it happens with every extension the PHP timeout is the most likely cause. I am making an educated guess that you have enabled the FTP options in Global Configuration to make your site work properly on the new server. This means that every file in every extension needs at least three FTP operations to be installed. This makes file operations slow and leads to PHP timeouts while installing extensions.
This issue is unrelated to our software. It is an issue which falls under generic hosting and Joomla! support. Per our Terms of Service we cannot provide any further assistance. Please contact your host and/or the
Joomla! forum.
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!