Easy Worship 7.1,4.9 not showing anything to the extended screen, despite being on Live; not even a black screen. It's not about the connections because if I try Powerpoint I can see the output.

Kindly help. Thanks.

Have you configured EW to use the extended display? See the following article to see how to do that. It's towards the bottom.

https://support.easyworship.com/support/solutions/articles/24000020382-screen-setup