You said it's a Roku 3, but your account shows a Roku 1 2710. The 2710 was released in 2013, while there are two versions of the Roku 3, one from 2013 and one from 2015. Both versions of the Roku 3 are still supported, as is the Roku 1. However, they are both getting rather long in the tooth when it comes to channel support and overall performance.
Can you be more specific about "nothing" working? Does the home screen load? Will it connect to your network? Will it connect to the Roku update server? What OS version is your player running? See Settings/System/About for the version number, as well as the specific model number of your Roku.
Dan
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution."
If you appreciate my answer, maybe give me a Kudo.
I am not a Roku employee, just another user.