No Internet connection

Since yesterday, I’ve been having a problem with my Home Assistant Green: it’s no longer accessible on my network. I’ve been using it for about five months, initially with DHCP, and later I assigned it a static IP address via my router. At first, I still seemed to have some connection to it and made some changes to the network settings, but now it’s completely unreachable. How can I fix this?

revert any network settings and so, other wise : After weeks of successful use, unable to connect to HA Green after Reset - #19 by Tolt

If it’s completly unreachable then how do you know it hasn’t crashed?

Step 1. Connect a keyboard and display to the Home Assistant host.